diff --git a/FD-23.00.004-strusoft.xsd b/FD-23.00.004-strusoft.xsd
new file mode 100644
index 00000000..4a3680f7
--- /dev/null
+++ b/FD-23.00.004-strusoft.xsd
@@ -0,0 +1,7377 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xs:schema id="StruSoftXsd"
+    targetNamespace="urn:strusoft"
+    xmlns="urn:strusoft"
+    xmlns:xs="http://www.w3.org/2001/XMLSchema"
+    elementFormDefault="qualified"
+    version="01.00.000"
+>
+  <!--
+  Main concepts:
+
+  This schema object is the common base schema object of StruSoft XML file format. In StruSoft XML
+  every structural distance are in meter, all size of steel joints are millimeter, all forces are in
+  kN, all moments are in kNm. Stiffness are in kN/m and kNm/rad. If a value is NULL, in this case
+  there is no stiffness or load on that direction. If a support or a connection value is 6e66 (evil's
+  number), that connection or support is fixed. If that value is non-zero, the value is equal of the
+  stiffness or the load.
+
+  The StruSoft XML always stores partial data. If the whole database is required, 1970.01.01 0:00:00
+  base time should be asked. This structure is the minimum of the common elements, all software could
+  add their own elements where it is possible (xs:any). All 3rd party tool must store the unused XML
+  elements, and must send back if it is necessary (when the entity is changed).
+
+  Data structure: Region groups are built up from regions. Regions built up from contours. The first
+  contour in a region is the outline. All other contours are holes. Every contours are built up from
+  edges. An edge could be line, arc, parabolic, spline, polyline and circle. The first point in edge
+  is the start point, the second is the end point. All other points are internal points, ordered from
+  the start point.
+
+  If the edge is circle, there are 2 possibilities to define it: 1) 1 point is defined: center point
+  of the circle. Normal vector and radius must also be defined! 2) 3 points are defined: 3 points
+  define a circle. The order of these points could modify the normal, or it also can be defined. If
+  the edge is arc, there are 2 possibilities to define it: 1) 1 point is defined: this point is the
+  center, so the radius, the normal vector, the start angle and the end angle must be defined! Local
+  x-axis should be defined. 2) 3 points are defined: start point, an internal curve point and the end
+  point.
+
+  Where normal vector is not defined the used default is: x="0" y="0" z="1""
+
+  Coding standard: attributes are prefered to store values: in this way in content handler class,
+  "character" member function could be ignored.
+
+
+  KNOWN ISSUES
+
+  Shell modelled bars: The FEM-Design can only exports the base bars to xml, without haunchs and
+  corbels.
+
+  Intermediate sections of bars: On import, the physical alignment of the bars is always "Not
+  automatically set", but the set values will be good.
+
+  - - -
+
+  If you have any question: batal@strusoft.hu, Skype: bataci (In Skype only text chat allowed.)
+  -->
+
+<!-- basic types-->
+
+  <!-- limited values -->
+  <xs:simpleType name="stage_number">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="32767"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="piece_number">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="100"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="last_stage_value">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="last_stage"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="stage_data">
+    <xs:union memberTypes="last_stage_value stage_number" />
+  </xs:simpleType>
+
+  <xs:simpleType name="stiffness_max_reached">
+    <xs:restriction base="xs:double">
+      <xs:enumeration value="6E66" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="from_1e-4_to_10">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1E-4"/>
+      <xs:maxInclusive value="10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="mass_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1E-15"/>
+      <xs:maxInclusive value="1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="stiffness_data_range">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E15"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="virtbar_data_range">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.00001"/>
+      <xs:maxInclusive value="1E15"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="clt_srf"> <!-- clt_stiffness_reduction_factor -->
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.1"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="dot1_to_100_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.1"/>
+      <xs:maxInclusive value="100"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="stiffnessdata_type">
+    <xs:union memberTypes="stiffness_data_range stiffness_max_reached" />
+  </xs:simpleType>
+
+  <!-- relative position in a segment, between 0.0 and 1.0. -->
+  <xs:simpleType name="position_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="inner_position_type">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxExclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="thousand_percent">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- relative positions in a line segment or curve segment, between 0.0 and 1.0. -->
+  <xs:complexType name="segmentposition_type">
+     <xs:attribute name="start"  type="position_type" use="required"/>
+     <xs:attribute name="end"    type="position_type" use="required"/>
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="min_half_max_10">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.5"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="min_1_max_10000">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1.0"/>
+      <xs:maxInclusive value="10000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="min_1_max_1e7">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1.0"/>
+      <xs:maxInclusive value="1E7"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="min_200_max_1e7">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="200.0"/>
+      <xs:maxInclusive value="1E7"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+
+  <xs:simpleType name="non_neg_max_10">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_20">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_50">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="50"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_100">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="100"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1000">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_10000">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="10000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e5">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E5"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e7">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E7"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e8">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E8"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e10">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e15">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E15"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e17">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E17"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e20">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e23">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E23"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_neg_max_1e30">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E30"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_10">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_100">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="100.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_500">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="500.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1000">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_10000">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="10000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e5">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E5"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e8">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E8"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e10">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e17">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E17"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e20">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_max_1e23">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E23"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="quadrant">
+    <xs:restriction base="xs:double">
+      <xs:enumeration value="0"/>
+      <xs:enumeration value="90"/>
+      <xs:enumeration value="180"/>
+      <xs:enumeration value="270"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_1">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1.0"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="from_1_to_1e5">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1.0"/>
+      <xs:maxInclusive value="1E5"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="from_1_to_1e8">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1.0"/>
+      <xs:maxInclusive value="1E8"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_10">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-10.0"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_1000">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1000.0"/>
+      <xs:maxInclusive value="1000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_10000">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-10000.0"/>
+      <xs:maxInclusive value="10000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_1e8">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1E8"/>
+      <xs:maxInclusive value="1E8"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_max_1e20">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1E20"/>
+      <xs:maxInclusive value="1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="one_quadrant">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1.5707963267949"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+
+  <xs:simpleType name="max_89dot9degree">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1.5690509975429"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_quadrant">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1.5707963267949"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="two_quadrants">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="3.14159265358979"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="abs_two_quadrants">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-3.14159265358979"/>
+      <xs:maxInclusive value="3.14159265358979"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="full_circle">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="6.28318530717959"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="orthotropy_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="reduction_factor_type">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="non_negative_double">
+     <xs:restriction base="xs:double">
+        <xs:minInclusive value="0"/>
+     </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="positive_double">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="int_0_to_10">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="int_1_to_3">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="3"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="int_1_to_100">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="100"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="int_1_to_1000">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="1000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="int_1_to_1024">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="1024"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="axis_limit">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="321272406"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="index_type">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="string15">
+    <xs:restriction base="xs:string">
+      <xs:pattern value=".{0,15}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="string63">
+    <xs:restriction base="xs:string">
+      <xs:pattern value=".{0,63}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="string255">
+    <xs:restriction base="xs:string">
+      <xs:pattern value=".{0,255}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- hexadecimal RGB color code w/o transparency,  hex chars: RRGGBB -->
+  <xs:simpleType name="rgb_color_type">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[0-9A-Fa-f]{6}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="transparency_type">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="255"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="entity_penwidth">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-10000.0"/>
+      <xs:maxInclusive value="+10000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="identifier">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="@{0,1}[ -#%'-;=?A-&#xfffd;]{0,50}(\.[0-9]{1,6}){0,2}" /> <!-- forbidden chars are '@', '$', '<' and '>,' -->
+    </xs:restriction>                                                           <!-- the lead in '@' means locked numbering     -->
+  </xs:simpleType>
+
+  <xs:simpleType name="name15">      <!-- for dimtext_type & user defined filters -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{0,15}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name40">      <!-- for spring & bolt data library types -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,40}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="comment_string">  <!-- for load comments -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{0,1023}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name79">      <!-- for load cases, load groups & CS descriptions -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,79}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name80">      <!-- for load cases -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,80}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name159">     <!-- for load combinations -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,159}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name255">    <!-- for moving loads & layers -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,255}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="name256">    <!-- for reference planes & CLT/GLT materials -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{1,256}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="nameMax256"> <!-- for storeys & diagram names -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[ -#%'-;=?A-&#xfffd;]{0,256}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="geometry_text1023"> <!-- From FD21.00.002, for text_type only! -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[&#x0009;&#x000A;&#x000d; -&#xfffd;]{0,1023}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="layer_name"> <!-- From FD21.00.003, for layers only! -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[&#x0009;&#x000A;&#x000d; -&#xfffd;]{1,255}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="material_0base_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxExclusive value="3.403E38"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="material_base_value">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxExclusive value="3.403E38"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="material_nu_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="0.499"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="general_material_base_value">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0"/>
+      <xs:maxInclusive value="1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="general_material_nu_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="0.499"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- timber panel attribute types -->
+  <xs:simpleType name="timber_service_class"> <!-- Warning: it is 1, 2 or 3 in the FD's user interface! -->
+    <xs:restriction base="xs:integer">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="2"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="timber_panel_thickness">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="100.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="delta_section_id">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="D[R]{0,1}[0-9]{2}-[0-9]{3}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--GUID types-->
+  <xs:simpleType name="guidtype">     <!-- GUID likes "012345678-9abc-def0-1234-56789ABCDEF0" -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="guidlist_type">
+    <xs:list itemType="guidtype"/>
+  </xs:simpleType>
+
+  <xs:simpleType name="spec_section_id" >         <!-- for refering complex or Delta sections, from FD20 -->
+    <xs:union memberTypes="guidtype  delta_section_id" />  <!-- until FD19 it was just a guidtype -->
+  </xs:simpleType>
+
+  <xs:simpleType name="indexed_guid"> <!-- GUID#index, index from 1 to 99999. From FD19 -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}#[1-9][0-9]{0,4}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--SHA1 hash type -> result is 160 bit -> 20 byte -> 40 hexa chars-->
+  <xs:simpleType name="hashtype">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[a-fA-F0-9]{40}"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="direction_2d_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="horizontal"/>
+      <xs:enumeration value="vertical"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="guid_list_type">
+     <xs:attribute name="guid" type="guidtype" use="required"/>
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="two_guid_list_type">
+     <xs:attribute name="first"  type="guidtype" use="required"/>
+     <xs:attribute name="second" type="guidtype" use="required"/>
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="three_guid_list_type">
+     <xs:attribute name="first"  type="guidtype" use="required"/>
+     <xs:attribute name="second" type="guidtype" use="optional"/> <!-- From FD 22.00.005 changed: required >> optional -->
+     <xs:attribute name="third"  type="guidtype" use="optional"/> <!-- From FD 22.00.005 changed: required >> optional -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="rectangle_type">
+    <xs:sequence>
+      <xs:element name="base_corner"  type="point_type_3d" /> <!--  the bottom-left corner of rectangle    -->
+      <xs:element name="x_direction"  type="point_type_3d" /> <!--  normal, points from base to the bottom-right corner -->
+      <xs:element name="y_direction"  type="point_type_3d" /> <!--  normal, points from base to the top-left corner     -->
+    </xs:sequence>
+     <xs:attribute name="x_size"      type="positive_max_10000" use="required"/>
+     <xs:attribute name="y_size"      type="positive_max_10000" use="required"/>
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- fd-mat types for sections -->
+  <xs:simpleType name="fd_mat_type">
+    <xs:restriction base="xs:integer">
+      <xs:enumeration value="0"/>        <!-- steel, rolled/default steel -->
+      <xs:enumeration value="1"/>        <!-- steel, cold worked -->
+      <xs:enumeration value="2"/>        <!-- steel, welded      -->
+      <xs:enumeration value="3"/>        <!-- concrete           -->
+      <xs:enumeration value="4"/>        <!-- timber             -->
+      <xs:enumeration value="65535"/>    <!-- unknown            -->
+      <xs:enumeration value="-1"/>       <!-- undefined          -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="detach_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value=""/>
+      <xs:enumeration value="x_tens"/>
+      <xs:enumeration value="x_comp"/>
+      <xs:enumeration value="y_tens"/>
+      <xs:enumeration value="y_comp"/>
+      <xs:enumeration value="z_tens"/>
+      <xs:enumeration value="z_comp"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="foundationsystems_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="simple"/>
+      <xs:enumeration value="surface_support_group"/>
+      <xs:enumeration value="from_soil"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="slabfoundationsystems_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="surface_support_group"/>
+      <xs:enumeration value="from_soil"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--visible line type-->
+  <xs:simpleType name="visiblelinetype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="line"/>
+      <xs:enumeration value="polyline"/>
+      <xs:enumeration value="spline"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--edge type-->
+  <xs:simpleType name="edgetype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="line"/>
+      <xs:enumeration value="arc"/>
+<!--  <xs:enumeration value="parabolic"/> - currently not implemented! -->
+      <xs:enumeration value="spline"/>      <!--  for solids/polyhedrons only -->
+      <xs:enumeration value="polyline"/>
+      <xs:enumeration value="circle"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--entity modification type-->
+  <xs:simpleType name="modification_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="added"/>
+      <xs:enumeration value="modified"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--entity modification type in axes and storeys,  currently NOT IMPLEMENTED! - ->
+  <xs:simpleType name="stored_reference_modification_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="added"/>
+      <xs:enumeration value="removed"/>
+    </xs:restriction>
+  </xs:simpleType> -->
+  <!--beam types-->
+  <xs:simpleType name="beamtype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="beam"/>
+      <xs:enumeration value="column"/>
+      <xs:enumeration value="truss"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--slab types-->
+  <xs:simpleType name="slabtype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="plate"/>
+      <xs:enumeration value="wall"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--panel type-->
+  <xs:simpleType name="paneltype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="concrete"/>
+      <xs:enumeration value="timber"  />  <!-- From FD18 -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--Alignment-->
+  <xs:simpleType name="hor_align">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="left"/>
+      <xs:enumeration value="center"/>
+      <xs:enumeration value="right"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="ver_align">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="top"/>
+      <xs:enumeration value="center"/>
+      <xs:enumeration value="bottom"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <xs:simpleType name="sf_rc_face">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="top"/>
+      <xs:enumeration value="bottom"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--pre defined section types-->
+  <xs:simpleType name="sectiontype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="custom"/>
+      <xs:enumeration value="I"/>
+      <xs:enumeration value="U"/>
+      <xs:enumeration value="rect"/>
+      <xs:enumeration value="circle"/>
+    </xs:restriction>
+  </xs:simpleType>
+  <!--standard type-->
+  <xs:simpleType name="standardtype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="EC"/>
+<!--  <xs:enumeration value="ANSI"/>
+      <xs:enumeration value="DIN"/>
+      <xs:enumeration value="BS"/>
+      <xs:enumeration value="MSZ"/>  -->
+      <xs:enumeration value="general"/>
+      <!--not applicable-->
+      <xs:enumeration value="n/a"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--Eurocode country code type-->
+  <!--http://en.wikipedia.org/wiki/List_of_international_vehicle_registration_codes-->
+  <xs:simpleType name="eurocodetype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="common"/>
+      <xs:enumeration value="H"/>
+      <xs:enumeration value="RO"/>
+      <xs:enumeration value="DK"/>
+      <xs:enumeration value="S"/>
+      <xs:enumeration value="N"/>
+      <xs:enumeration value="FIN"/>
+      <xs:enumeration value="GB"/>  <!-- It must be 'GB', not 'UK'! -->
+      <xs:enumeration value="D"/>
+      <xs:enumeration value="PL"/>
+      <xs:enumeration value="TR"/>
+      <xs:enumeration value="EST"/>
+      <xs:enumeration value="LT"/>
+      <xs:enumeration value="NL"/>
+      <xs:enumeration value="B"/>
+      <xs:enumeration value="E"/>
+      <!--not applicable-->
+      <xs:enumeration value="n/a"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--steel made type-->
+  <xs:simpleType name="steelmadetype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="rolled"/>
+      <xs:enumeration value="cold_worked"/>
+      <xs:enumeration value="welded"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- planar direction type -->
+  <xs:simpleType name="direction_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="x"/>
+      <xs:enumeration value="y"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--Version type-->
+  <xs:simpleType name="versiontype">
+    <xs:restriction base="xs:string">
+      <xs:pattern value="[0-9]{2}\.[0-9]{2}\.[0-9]{3}" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--empty type-->
+  <xs:complexType name="empty_type" />
+
+
+  <!-- Request - requests are currently not implemented! - ->
+  <xs:simpleType name="request_value_type">
+    <xs:restriction base="xs:string">
+      <!- -displacements- ->
+      <xs:enumeration value="e_x"/>
+      <xs:enumeration value="e_y"/>
+      <xs:enumeration value="e_z"/>
+      <xs:enumeration value="e_max"/><!- -global- ->
+      <!- -stresses- ->
+      <xs:enumeration value="s_x"/>
+      <xs:enumeration value="s_y"/>
+      <xs:enumeration value="s_z"/>
+      <xs:enumeration value="s_xy"/>
+      <xs:enumeration value="s_xz"/>
+      <xs:enumeration value="s_yz"/>
+      <xs:enumeration value="s_1"/>
+      <xs:enumeration value="s_2"/>
+      <xs:enumeration value="s_3"/>
+      <!- -von Mises stress- ->
+      <xs:enumeration value="s_eq"/>
+      <!- -global stresses- ->
+      <xs:enumeration value="s_1_max"/>
+      <xs:enumeration value="s_2_max"/>
+      <xs:enumeration value="s_3_max"/>
+      <xs:enumeration value="s_eq_max"/>
+      <!- -internal forces in section- ->
+      <xs:enumeration value="F_x"/>
+      <xs:enumeration value="F_y"/>
+      <xs:enumeration value="F_z"/>
+      <xs:enumeration value="M_x"/>
+      <xs:enumeration value="M_y"/>
+      <xs:enumeration value="M_z"/>
+    </xs:restriction>
+  </xs:simpleType> -->
+
+  <!--entity color-->
+  <xs:complexType name="entity_color" >
+    <xs:attribute name="tone"         type="rgb_color_type"    use="required" />
+    <xs:attribute name="penwidth"     type="entity_penwidth"   use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--reference type-->
+  <xs:complexType name="reference_type" >
+    <xs:attribute name="guid" type="guidtype" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--reference list -->
+  <xs:complexType name="referencelist_type" >
+    <xs:sequence>
+      <xs:element name="ref" type="reference_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:attributeGroup name="coord2d">
+    <xs:attribute name="x"            type="xs:double"  use="required" />
+    <xs:attribute name="y"            type="xs:double"  use="required" />
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="coord3d">
+    <xs:attributeGroup ref= "coord2d"/>
+    <xs:attribute      name="z"       type="xs:double"  use="required" />
+  </xs:attributeGroup>
+
+  <!--minimum attributes of an entity-->
+  <xs:attributeGroup name="entity_attribs">
+    <xs:attribute name="guid"          type="guidtype"          use="required" />
+    <xs:attribute name="last_change"   type="xs:dateTime"       use="required" />
+    <xs:attribute name="action"        type="modification_type" use="required" />
+    <xs:attribute name="hash_order_id" type="xs:integer"        default="-1"   /> <!-- Currently not used in FD -->
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="optional_entity_attribs">
+    <xs:attribute name="guid"          type="guidtype"          default="00000000-0000-0000-0000-000000000000" />
+    <xs:attribute name="last_change"   type="xs:dateTime"       default="1970-01-01T00:00:00.000" />
+    <xs:attribute name="action"        type="modification_type" default="added" />
+    <xs:attribute name="hash_order_id" type="xs:integer"        default="-1" />
+  </xs:attributeGroup>
+
+  <!-- Graphical attributes -->
+  <xs:attributeGroup name="fillcolor_attribs">
+    <xs:attribute name="fillmode"  type="xs:unsignedInt"   default="1" />
+    <xs:attribute name="fillcolor" type="xs:unsignedInt"   default="0" />
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="graph_attribs" >
+    <xs:attribute name="linetype" type="guidtype"       use="optional" />
+    <xs:attribute name="color"    type="xs:unsignedInt" use="optional" />
+    <xs:attribute name="pen"      type="xs:double"      use="optional" />
+    <xs:attributeGroup ref="fillcolor_attribs" />
+  </xs:attributeGroup>
+
+  <!-- start & end -->
+  <xs:attributeGroup name="start_end_attribs">
+     <xs:attribute name="start"    type="non_negative_double" use="required" />
+     <xs:attribute name="end"      type="non_negative_double" use="required" />
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="unchecked_start_end_attribs">
+     <xs:attribute name="start"    type="xs:double" use="required" />
+     <xs:attribute name="end"      type="xs:double" use="required" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="start_end_type">
+     <xs:attributeGroup ref="start_end_attribs" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- Eccentricity of beams and columns - from FD15 -->
+  <xs:complexType name="ecc_value_type">
+    <xs:attribute name="x" type="abs_max_1000" use="required" />
+    <xs:attribute name="y" type="abs_max_1000" use="required" />
+    <xs:attribute name="z" type="abs_max_1000" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="eccentricity_type">
+    <xs:sequence>
+      <xs:element name="analytical" type="ecc_value_type" minOccurs="2" maxOccurs="2" />
+      <xs:element name="physical"   type="ecc_value_type" minOccurs="2" maxOccurs="2" />
+    </xs:sequence>
+    <xs:attribute name="use_default_physical_alignment" type="xs:boolean" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- Connectivity attribs: moves and rotates -->
+  <xs:complexType name="connectivity_type">
+    <xs:attribute name="m_x"         type="xs:boolean"        use="required" />
+    <xs:attribute name="m_x_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if m_x is false, from FD15 -->
+    <xs:attribute name="m_y"         type="xs:boolean"        use="required" />
+    <xs:attribute name="m_y_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if m_y is false, from FD15 -->
+    <xs:attribute name="m_z"         type="xs:boolean"        use="required" />
+    <xs:attribute name="m_z_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if m_z is false, from FD15 -->
+    <xs:attribute name="r_x"         type="xs:boolean"        use="required" />
+    <xs:attribute name="r_x_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if r_x is false, from FD15 -->
+    <xs:attribute name="r_y"         type="xs:boolean"        use="required" />
+    <xs:attribute name="r_y_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if r_y is false, from FD15 -->
+    <xs:attribute name="r_z"         type="xs:boolean"        use="required" />
+    <xs:attribute name="r_z_release" type="non_neg_max_1e10"  default="0" />    <!-- valid only if r_z is false, from FD15 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- Plasticity attribs: compression and tension limits -->
+  <xs:complexType name="plasticity_type">
+    <xs:attribute name="neg"    type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="pos"    type="non_neg_max_1e15"  use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="plasticity_type2">  <!-- from FD20 -->
+
+    <xs:attribute name="neg"    type="non_neg_max_1e15"  use="required" />
+    <xs:attribute name="pos"    type="non_neg_max_1e15"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="plasticity_type_3d">
+    <xs:attribute name="x_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="x_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="y_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="y_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="z_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="z_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="plasticity3d_force_record"> <!-- from FD20 -->
+    <xs:attribute name="force_x_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="force_x_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="force_y_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="force_y_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="force_z_neg"  type="non_neg_max_1e15"  use="optional" />
+    <xs:attribute name="force_z_pos"  type="non_neg_max_1e15"  use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="plasticity3d_record"> <!-- from FD20 -->
+    <xs:complexContent>
+      <xs:extension base="plasticity3d_force_record">
+        <xs:attribute name="moment_x_neg"  type="non_neg_max_1e15"  use="optional" />
+        <xs:attribute name="moment_x_pos"  type="non_neg_max_1e15"  use="optional" />
+        <xs:attribute name="moment_y_neg"  type="non_neg_max_1e15"  use="optional" />
+        <xs:attribute name="moment_y_pos"  type="non_neg_max_1e15"  use="optional" />
+        <xs:attribute name="moment_z_neg"  type="non_neg_max_1e15"  use="optional" />
+        <xs:attribute name="moment_z_pos"  type="non_neg_max_1e15"  use="optional" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+
+  <!-- Prestressing: -->
+  <xs:complexType name="camber_type">
+    <xs:attribute name="force"  type="positive_max_1e10"  use="required" />
+    <xs:attribute name="e"      type="positive_max_10000" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+  <xs:complexType name="camber_type_2d">
+    <xs:attribute name="force"  type="positive_max_1e10"  use="required" />
+    <xs:attribute name="e_y"    type="abs_max_10000"      use="required" />
+    <xs:attribute name="e_z"    type="abs_max_10000"      use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--1D point or vector-->
+  <xs:complexType name="point_type_1d">
+    <xs:attribute name="x" type="xs:double" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+  <!--2D points or vectors-->
+  <xs:complexType name="point_type_2d">
+    <xs:complexContent>
+      <xs:extension base="point_type_1d">
+        <xs:attribute name="y" type="xs:double" use="required" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!--3D point or vector-->
+  <xs:complexType name="point_type_3d">
+    <xs:complexContent>
+      <xs:extension base="point_type_2d">
+        <xs:attribute name="z" type="xs:double" use="required" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!--4D point or vector for thickness points & load forces-->
+  <xs:complexType name="location_value">
+    <xs:complexContent>
+      <xs:extension base="point_type_3d">                              <!-- In case of line loads this is just write only information, it is the same with the endpoints of the line -->
+        <xs:attribute name="val" type="abs_max_1e20" use="required" /> <!-- Warning! Revit supports only ±1e9 kN in case of loads! -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="topbottom_value"> <!-- From FD18 -->
+    <xs:complexContent>
+      <xs:extension base="point_type_3d">
+        <xs:attribute name="top_val"    type="abs_max_1e20" use="required" />
+        <xs:attribute name="bottom_val" type="abs_max_1e20" use="required" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- =====  Structure types   ===== -->
+
+  <!-- Physical extent type, from FD18 -->
+  <xs:complexType name="phe_type">
+    <xs:attribute      name="offset"              type="positive_max_1000"  use="required"  />
+    <xs:attribute      name="shrink"              type="xs:boolean"         default="false" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--Edge type-->
+  <xs:complexType name="edge_type">
+    <xs:sequence>
+      <!--ordered internal points, or the center of the circle/arc-->
+      <xs:element name="point"           type="point_type_3d"        minOccurs="1" maxOccurs="unbounded"/>
+      <!--normal of the curve; it must be used if the curve is arc or circle-->
+      <xs:element name="normal"          type="point_type_3d"        minOccurs="0" />
+      <!--axis of base line (the value default is the x axis [1.0,0.0,0.0]) angles are measured from this direction-->
+      <xs:element name="x_axis"          type="point_type_3d"        minOccurs="0" />
+      <xs:element name="edge_connection" type="ec_type"              minOccurs="0" maxOccurs="1"/>
+      <xs:element name="physical_extent" type="phe_type"             minOccurs="0" maxOccurs="1"/> <!-- From FD18 -->
+    </xs:sequence>
+    <xs:attribute name="type"        type="edgetype"  use="required" />
+    <xs:attribute name="radius"      type="positive_max_1000" use="optional" />
+    <xs:attribute name="start_angle" type="xs:double" use="optional" />
+    <xs:attribute name="end_angle"   type="xs:double" use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="opt_localsys_type">
+    <xs:sequence>
+      <xs:element name="local_pos"        type="point_type_3d" />
+      <xs:element name="local_x"          type="point_type_3d" />
+      <xs:element name="local_y"          type="point_type_3d" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="localsys_type">
+    <xs:sequence>
+      <xs:element name="centre"           type="point_type_3d" />
+      <xs:element name="local_x"          type="point_type_3d" />
+      <xs:element name="local_y"          type="point_type_3d" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="untested_localsys_type">
+    <xs:sequence>
+      <xs:element name="pos"              type="point_type_3d" />
+      <xs:element name="x"                type="point_type_3d" />
+      <xs:element name="y"                type="point_type_3d" />
+      <xs:element name="z"                type="point_type_3d" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--Contour type-->
+  <xs:complexType name="contour_type">
+    <xs:sequence>
+      <xs:element name="edge" type="edge_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--Region type-->
+  <xs:complexType name="region_type">
+    <xs:sequence>
+      <xs:element name="contour" type="contour_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--Drawing Region type-->
+  <xs:complexType name="drawing_region_type">
+    <xs:sequence>
+      <xs:element name="contour" type="contour_type" minOccurs="1" maxOccurs="unbounded" />
+      <xs:element name="style"   type="style_type"   minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute name="guid"   type="guidtype"      use="optional"/>  <!-- but required from FD21 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--Region group type-->
+  <xs:complexType name="region_group_type">
+    <xs:sequence>
+      <xs:element name="region" type="region_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="stiffness_factor_data">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="slab_stiffness_record">
+    <xs:attribute name="bending_1_1" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="bending_2_2" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="bending_1_2" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="membran_1_1" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="membran_2_2" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="membran_1_2" type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="shear_1_3"   type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="shear_2_3"   type="stiffness_factor_data" use="required"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="slab_stiffness_factors">
+    <xs:sequence>
+      <xs:element name="factors" type="slab_stiffness_record" minOccurs="10" maxOccurs="10" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--slab part-->
+  <xs:complexType name="slab_part_type">
+    <xs:sequence>
+      <xs:element name="contour"                type="contour_type"   minOccurs="1" maxOccurs="unbounded" />
+      <xs:element name="thickness"              type="location_value" minOccurs="1" maxOccurs="3" />
+      <xs:element name="local_pos"              type="point_type_3d" />
+      <xs:element name="local_x"                type="point_type_3d" />
+      <xs:element name="local_y"                type="point_type_3d" />
+      <xs:element name="stiffness_modifiers"    type="slab_stiffness_factors" minOccurs="0" maxOccurs="1" />   <!-- From FD20 -->
+      <xs:element name="colouring"              type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+      <xs:element name="end"                    type="empty_type" />
+      <!--additional elements could be added by FEM Design or RevIt-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"             type="identifier"       use="optional" />
+    <xs:attribute      name="complex_material" type="guidtype"         use="required" />
+    <xs:attribute      name="alignment"        type="ver_align"        use="required" />
+    <xs:attribute      name="align_offset"     type="abs_max_1e20"     use="optional" />
+    <xs:attribute      name="ortho_alfa"       type="two_quadrants"    use="optional" />
+    <xs:attribute      name="ortho_ratio"      type="orthotropy_type"  use="optional" />
+    <xs:attribute      name="ecc_calc"         type="xs:boolean"       default="false" />
+    <xs:attribute      name="ecc_crack"        type="xs:boolean"       default="false" />
+    <xs:attribute      name="refracting_angle" type="one_quadrant"     use="optional"  />      <!-- default="1.74532925199" -->
+    <xs:attribute      name="mesh_size"        type="non_neg_max_1e20" default="0.0"   />      <!-- average surface element size, from FD19 -->
+    <xs:attribute      name="stage"            type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"        type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--buckling types-->
+  <xs:simpleType name="bar_buckling_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="flexural_weak"/>
+      <xs:enumeration value="flexural_stiff"/>
+      <xs:enumeration value="pressured_flange"/>          <!-- only for steel bars, it is the top flange from FD18 -->
+      <xs:enumeration value="lateral_torsional"/>         <!-- only for timber bars -->
+      <xs:enumeration value="pressured_bottom_flange" />  <!-- From FD18; only for steel bars -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- Bar buckling record -->
+  <xs:complexType name="buckling_record">
+    <xs:choice>
+      <xs:sequence>
+        <xs:element name="start_point" type="point_type_3d" />
+        <xs:element name="end_point"   type="point_type_3d" />
+      </xs:sequence>
+      <!-- new choice from FD18 -->
+      <xs:sequence>
+        <xs:element name="position"    type="segmentposition_type" />
+      </xs:sequence>
+    </xs:choice>
+    <xs:attribute name="type"                   type="bar_buckling_type" use="required"  />
+    <xs:attribute name="beta"                   type="non_neg_max_100"   default="1.0"   />
+    <xs:attribute name="continously_restrained" type="xs:boolean"        default="false" />
+    <xs:attribute name="cantilever"             type="xs:boolean"        default="false" />   <!-- valid for timber bars only -->
+    <xs:attribute name="load_position"          type="ver_align"         default="top"   />
+    <xs:attribute name="sway"                   type="xs:boolean"        default="false" />   <!-- valid for flexural types only,  from FD18 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- Bar buckling data -->
+  <xs:complexType name="buckling_data_type">
+    <xs:sequence>
+      <xs:element name="buckling_length" type="buckling_record" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!-- Apex buckling data -->
+  <xs:complexType name="apex_buckling_type">
+    <xs:sequence>
+      <xs:element name="buckling_length" type="buckling_record" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!-- shell buckling -->
+  <xs:complexType name="shell_buckling_type">
+    <xs:sequence>
+      <xs:element name="direction"   type="point_type_3d" />
+      <xs:element name="contour"     type="contour_type"  />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="base_shell"  type="guidtype"           use="required" />
+    <xs:attribute name="beta"        type="non_neg_max_100"    default="0"    />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- COMPOSITE parts, from FD 17.000.02 -->
+  <xs:simpleType name="composite_prop_name">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="b"/>
+      <xs:enumeration value="b_eff"/>
+      <xs:enumeration value="bb"/>
+      <xs:enumeration value="bc"/>
+      <xs:enumeration value="bf"/>
+      <xs:enumeration value="bt"/>
+      <xs:enumeration value="cy"/>
+      <xs:enumeration value="cz"/>
+      <xs:enumeration value="d"/>
+      <xs:enumeration value="d1"/> <!-- From FD20 -->
+      <xs:enumeration value="d2"/> <!-- From FD20 -->
+      <xs:enumeration value="fill_beam"/>
+      <xs:enumeration value="h"/>
+      <xs:enumeration value="hc"/>
+      <xs:enumeration value="name"/>
+      <xs:enumeration value="o1"/>
+      <xs:enumeration value="o2"/>
+      <xs:enumeration value="t"/>
+      <xs:enumeration value="tf"/>
+      <xs:enumeration value="tfb"/>
+      <xs:enumeration value="tft"/>
+      <xs:enumeration value="th"/>
+      <xs:enumeration value="tw"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="composite_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="beam_a"/>
+      <xs:enumeration value="beam_b"/>
+      <xs:enumeration value="beam_p"/>
+      <xs:enumeration value="column_a"/>
+      <xs:enumeration value="column_c"/>
+      <xs:enumeration value="column_d"/>
+      <xs:enumeration value="column_e"/>
+      <xs:enumeration value="column_f"/>
+      <xs:enumeration value="column_g"/> <!-- From FD20 -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="composite_part_type">
+    <xs:attribute name="material"      type="guidtype"   use="required" />
+    <xs:attribute name="section"       type="guidtype"   use="required" />
+    <xs:attribute name="cog_offset_x"  type="xs:double"  default="0" />   <!-- not used from FD23.00.002! -->
+    <xs:attribute name="cog_offset_y"  type="xs:double"  default="0" />   <!-- not used from FD23.00.002! -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="composite_prop_type">
+    <xs:attribute name="name"  type="composite_prop_name"    use="required" />
+    <xs:attribute name="value" type="xs:string"              use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="composite_data">
+    <xs:sequence>
+      <xs:element name="part"     type="composite_part_type" minOccurs="2" maxOccurs="8" /> <!-- parts must be in composite's original order! -->
+      <xs:element name="property" type="composite_prop_type" minOccurs="0" maxOccurs="11" />
+    </xs:sequence>
+    <xs:attribute      name="type" type="composite_type" use="required" />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- composite section type, from FD 17.000.02 -->
+  <xs:complexType name="composite_section_type">
+    <xs:attribute name="guid" type="guidtype" use="required"/>
+    <xs:attribute name="pos"  type="position_type" use="required"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- complex composite type, from FD 17.000.02 -->
+  <xs:complexType name="complex_composite_type">
+    <xs:sequence>
+      <xs:element name="composite_section" type="composite_section_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="bar_stiffness_factor_record">
+    <xs:attribute name="cross-sectional_area"   type="stiffness_factor_data" use="required"/>
+    <xs:attribute name="shear_area_direction_1" type="stiffness_factor_data" default="1.0"/>  <!-- it is not used in the case of trusses -->
+    <xs:attribute name="shear_area_direction_2" type="stiffness_factor_data" default="1.0"/>  <!-- it is not used in the case of trusses -->
+    <xs:attribute name="torsional_constant"     type="stiffness_factor_data" default="1.0"/>  <!-- it is not used in the case of trusses -->
+    <xs:attribute name="inertia_about_axis_1"   type="stiffness_factor_data" default="1.0"/>  <!-- it is not used in the case of trusses -->
+    <xs:attribute name="inertia_about_axis_2"   type="stiffness_factor_data" default="1.0"/>  <!-- it is not used in the case of trusses -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="bar_stiffness_factors">
+    <xs:sequence>
+      <xs:element name="factors" type="bar_stiffness_factor_record" minOccurs="10" maxOccurs="10" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--Bar part type-->
+  <xs:complexType name="bar_part_type">
+    <xs:sequence>
+      <xs:element name="curve"        type="edge_type" />
+      <xs:element name="local-y"      type="point_type_3d" />
+      <!--You must add stiffness for beam and coloumn (and not for truss)-->
+      <xs:element name="connectivity"  type="connectivity_type"    minOccurs="0" maxOccurs="2" />
+      <xs:element name="eccentricity"  type="eccentricity_type"    minOccurs="0" maxOccurs="1" />  <!-- minOccurs="0" just for compatibility reasons, but must have from FD15! -->
+      <xs:element name="buckling_data" type="buckling_data_type"   minOccurs="0" maxOccurs="1" />  <!-- From FD15.00.004, only for simple import-export, not for update;
+                                                                                                   updateable from FD18,
+                                                                                                   there are no bucklings for composite bars and Delta beams. -->
+      <xs:element name="camber_simulation"    type="camber_type_2d"         minOccurs="0" maxOccurs="1" />   <!-- From FD17 -->
+      <xs:element name="stiffness_modifiers"  type="bar_stiffness_factors"  minOccurs="0" maxOccurs="1" />   <!-- From FD20, only for beams & columns -->
+      <xs:element name="colouring"            type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+      <xs:element name="end"                  type="empty_type" />
+      <!--additional elements could be added by WIN-Statik-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                     type="identifier"      default="" />      <!-- empty names generates "C" or "B" (column/bar) IDs in FD -->
+    <xs:attribute      name="complex_material"         type="guidtype"        use="optional" />  <!-- But required for simple (non-composite & non-Delta) bars! -->
+    <xs:attribute      name="complex_section"          type="spec_section_id" use="optional" />  <!-- But required for non-composite bars, including Delta beams from FD20! -->
+    <xs:attribute      name="complex_composite"        type="guidtype"        use="optional" />  <!-- But required for composite bars! - from FD 17.000.02 -->
+    <xs:attribute      name="made"                     type="steelmadetype"   default="rolled" />
+    <xs:attribute      name="ecc_mode"                 type="xs:boolean"      default="false" />
+    <xs:attribute      name="ecc_calc"                 type="xs:boolean"      default="false" /> <!-- this value is always 'true' from FD15 -->
+    <xs:attribute      name="ecc_crack"                type="xs:boolean"      default="false" />
+    <xs:attribute      name="first_order_analysis_U"   type="xs:boolean"      default="false" /> <!-- Not used from FD23! :: From FD21, only for beams & columns! -->
+    <xs:attribute      name="first_order_analysis_Sq"  type="xs:boolean"      default="false" /> <!-- Not used from FD23! :: From FD21, only for beams & columns! -->
+    <xs:attribute      name="first_order_analysis_Sf"  type="xs:boolean"      default="false" /> <!-- Not used from FD23! :: From FD21, only for beams & columns! -->
+    <xs:attribute      name="first_order_analysis_Sc"  type="xs:boolean"      default="false" /> <!-- Not used from FD23! :: From FD21, only for beams & columns! -->
+    <xs:attribute      name="stage"                    type="stage_number"    default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"                type="stage_data"      default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="truss_limit_type">
+    <xs:attribute      name="value"         type="non_neg_max_1e20" use="required"  />
+  </xs:complexType>
+
+  <xs:complexType name="simple_truss_capacity_type">
+    <xs:sequence>
+      <xs:element name="limit_force"        type="truss_limit_type" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="simple_truss_behaviour_type">
+    <xs:choice>
+      <xs:element name="elastic"            type="empty_type" />
+      <xs:element name="brittle"            type="simple_truss_capacity_type" />
+      <xs:element name="plastic"            type="simple_truss_capacity_type" />
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:complexType name="simple_truss_chr_type">
+    <xs:sequence>
+      <xs:element name="compression"        type="simple_truss_behaviour_type" />
+      <xs:element name="tension"            type="simple_truss_behaviour_type" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="truss_capacity_type">
+    <xs:sequence>
+      <xs:element name="limit_force"        type="truss_limit_type" minOccurs="9" maxOccurs="9" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="truss_behaviour_type">
+    <xs:choice>
+      <xs:element name="elastic"            type="empty_type" />
+      <xs:element name="brittle"            type="truss_capacity_type" />
+      <xs:element name="plastic"            type="truss_capacity_type" />
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:complexType name="truss_chr_type">
+    <xs:sequence>
+      <xs:element name="compression"        type="truss_behaviour_type" />
+      <xs:element name="tension"            type="truss_behaviour_type" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="apex_type">
+    <xs:sequence>
+      <xs:element name="center"             type="point_type_3d" />
+      <xs:element name="intersection_point" type="point_type_3d" />
+      <xs:element name="buckling_data"      type="apex_buckling_type"   minOccurs="2" maxOccurs="2" />
+      <xs:element name="colouring"          type="entity_color"         minOccurs="0" maxOccurs="1" />   <!-- From FD23, the last colored apex in the bar's apex list colors the entire bar -->
+    </xs:sequence>
+    <xs:attribute      name="r"             type="dot1_to_100_type" use="required"  />
+    <xs:attribute      name="rounded_edge"  type="xs:boolean"       default="false" />
+    <xs:attribute      name="stage_A"       type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="stage_B"       type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage_A"   type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+    <xs:attribute      name="end_stage_B"   type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+  </xs:complexType>
+
+  <xs:simpleType name="shell_model_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="none"/>
+      <xs:enumeration value="simple"  /> <!-- shell model contains only shell elements -->
+      <xs:enumeration value="complex" /> <!-- fictitious bars on the boundary of the shell model -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--Bar type-->
+  <xs:complexType name="bar_type">
+    <xs:sequence>
+
+      <xs:choice>
+        <xs:sequence> <!-- The original bar sequence. Two or more bar parts for old apexed beams compatibility only, otherwise USE ONLY ONE! -->
+          <xs:element name="bar_part"       type="bar_part_type"  minOccurs="1" maxOccurs="unbounded" />
+        </xs:sequence>
+
+        <xs:sequence> <!-- new choice from FD20,  only for apexed beams! -->
+          <xs:element name="apex"           type="apex_type"      minOccurs="1" maxOccurs="unbounded" />
+          <xs:element name="bar_part"       type="bar_part_type"  minOccurs="2" maxOccurs="unbounded" />
+        </xs:sequence>
+      </xs:choice>
+
+      <xs:element name="truss_behaviour"    type="truss_chr_type" minOccurs="0" maxOccurs="1" />   <!-- From FD20, used only for trusses -->
+      <xs:element name="end"                type="empty_type" />
+        <!--additional elements could be added by WIN-Statik-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                    type="identifier"        use="optional"  />      <!-- From FD 17.00.002, the imported value is currently not used in the FD. -->
+    <xs:attribute      name="type"                    type="beamtype"          use="required"  />
+    <xs:attribute      name="shell_model"             type="shell_model_type"  default="none"  />      <!-- From FD20, only for beams & columns, not for trusses -->
+    <xs:attribute      name="stage"                   type="stage_number"      default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"               type="stage_data"        default="last_stage" /> <!-- From FD22 -->
+
+    <!-- The next four attributes used for trusses in pre-FD20 files. This data DOES NOT USED when "truss_behaviour" element was set -->
+    <xs:attribute      name="maxforce"                type="non_neg_max_1e30"  use="optional"  /> <!-- For trusses only. From FD17 it is used as Compression's limited capacity -->
+    <xs:attribute      name="compressions_plasticity" type="xs:boolean"        default="false" /> <!-- From FD17, it used if 'maxforce' exists only -->
+    <xs:attribute      name="tension"                 type="non_neg_max_1e30"  use="optional"  /> <!-- From FD17, for trusses only -->
+    <xs:attribute      name="tensions_plasticity"     type="xs:boolean"        default="false" /> <!-- From FD17, it used if 'tension' exists only -->
+
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- Hidden bar type, from FD18 -->
+  <xs:complexType name="hidden_bar_type">
+    <xs:sequence>
+      <xs:element name="rectangle"     type="rectangle_type" />
+      <xs:element name="start"         type="point_type_3d"      minOccurs="0" maxOccurs="1" /> <!-- From FD21 and required from FD21! -->
+      <xs:element name="buckling_data" type="buckling_data_type" minOccurs="0" maxOccurs="1" />
+      <xs:element name="end"           type="empty_type" />
+      <!--additional elements-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                    type="identifier"        use="optional"  />
+    <xs:attribute      name="base_shell"              type="guidtype"          use="required"  />
+    <xs:attribute      name="axis_in_longer_side"     type="xs:boolean"        default="true"  /> <!-- From FD21 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--Slab type-->
+  <xs:complexType name="slab_type">
+    <xs:sequence>
+      <xs:element name="slab_part" type="slab_part_type" minOccurs="1" maxOccurs="unbounded" />
+      <xs:element name="end"       type="empty_type" />
+      <!--additional elements could be added by FEM Design or RevIt-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"       type="identifier"   use="optional" />        <!-- From FD 17.00.002, the imported value is currently not used in the FD. -->
+    <xs:attribute      name="type"       type="slabtype"     use="required" />
+    <xs:attribute      name="stage"      type="stage_number" default="1" />           <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"  type="stage_data"   default="last_stage" />  <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="simple_stiffness_type">
+    <xs:sequence>
+      <xs:element name="mov_x" type="stiff_base_type" />
+      <xs:element name="rot_x" type="stiff_base_type" />
+      <xs:element name="mov_y" type="stiff_base_type" />
+      <xs:element name="rot_y" type="stiff_base_type" />
+      <xs:element name="mov_z" type="stiff_base_type" />
+      <xs:element name="rot_z" type="stiff_base_type" />
+    </xs:sequence>
+    <xs:attribute name="detach" type="detach_type" default="" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="stiffness_matrix_2_type">
+    <xs:attribute name="xz" type="positive_max_1e20" use="required" />
+    <xs:attribute name="yz" type="positive_max_1e20" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="stiffness_matrix_4_type">
+    <xs:attribute name="xx"  type="positive_max_1e20"     use="required" />
+    <xs:attribute name="xy"  type="non_neg_max_1e20"      use="required" />
+    <xs:attribute name="yy"  type="positive_max_1e20"     use="required" />
+    <xs:attribute name="gxy" type="positive_max_1e20"     use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="stiffness_type">                  <!-- From FD18 -->
+    <xs:attribute name="x_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="x_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="y_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="y_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="z_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="z_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+  <xs:complexType name="stiffness_motion_record">           <!-- From FD20 -->
+    <xs:attribute name="Kx_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="Kx_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="Ky_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="Ky_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="Kz_neg"  type="stiffnessdata_type"  use="required" />
+    <xs:attribute name="Kz_pos"  type="stiffnessdata_type"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="stiffness_record">                  <!-- From FD20 -->
+    <xs:complexContent>
+      <xs:extension base="stiffness_motion_record">
+        <xs:attribute name="Cx_neg"  type="stiffnessdata_type"  use="required" />
+        <xs:attribute name="Cx_pos"  type="stiffnessdata_type"  use="required" />
+        <xs:attribute name="Cy_neg"  type="stiffnessdata_type"  use="required" />
+        <xs:attribute name="Cy_pos"  type="stiffnessdata_type"  use="required" />
+        <xs:attribute name="Cz_neg"  type="stiffnessdata_type"  use="required" />
+        <xs:attribute name="Cz_pos"  type="stiffnessdata_type"  use="required" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+
+  <xs:complexType name="stiffness_with_friction">
+    <xs:complexContent>
+       <xs:extension base="simple_stiffness_type">
+         <xs:attribute name="friction" type="reduction_factor_type" default="0.3" />
+         <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- ====================  Timber panel types  ========================================-->
+
+  <!--Internal panel type-->
+  <xs:complexType name="internal_panel_type">
+    <xs:sequence>
+      <xs:element name="region"    type="region_type"      minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute name="guid"      type="guidtype"         use="required" />
+    <xs:attribute name="mesh_size" type="non_neg_max_1e20" default="0.0"  /> <!-- average surface element size, from FD19 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--Timber application data type -->
+  <xs:complexType name="timber_factors_type">
+    <xs:attribute name="gamma_m_u"          type="positive_max_10"      use="required" />
+    <xs:attribute name="gamma_m_as"         type="positive_max_10"      use="required" />
+    <xs:attribute name="kdef_U"             type="non_neg_max_10"       use="required" />
+    <xs:attribute name="kdef_Sq"            type="non_neg_max_10"       use="required" />
+    <xs:attribute name="kdef_Sf"            type="non_neg_max_10"       use="required" />
+    <xs:attribute name="kdef_Sc"            type="non_neg_max_10"       use="required" />
+    <xs:attribute name="service_class"      type="timber_service_class" use="required" />
+    <xs:attribute name="system_factor"      type="positive_max_10"      use="required" />
+    <xs:anyAttribute                        processContents="skip"/>
+  </xs:complexType>
+
+  <xs:attributeGroup name="old_orthotropic_appdata" >  <!-- Required only for FD18's simple timber panels (this is part of timber_data element from FD19) -->
+    <xs:attribute name="gamma_m_u"     type="positive_max_10"      use="optional" />
+    <xs:attribute name="gamma_m_as"    type="positive_max_10"      use="optional" />
+    <xs:attribute name="service_class" type="timber_service_class" use="optional" />
+    <xs:attribute name="system_factor" type="positive_max_10"      use="optional" />
+  </xs:attributeGroup>
+
+
+  <!--Panel type-->
+  <xs:complexType name="panel_type">
+    <xs:sequence>
+      <xs:element name="region"       type="region_type" />
+      <xs:element name="direction"    type="point_type_3d" />
+      <xs:element name="anchor_point" type="point_type_3d" />
+      <!-- Local system's origin, if it's not same as anchor point: -->
+      <xs:element name="local_pos"    type="point_type_3d"      minOccurs="0" maxOccurs="1" /> <!-- From FD19.00.004, -->
+
+      <xs:element name="internal_panels" minOccurs="0">
+         <xs:complexType>
+           <xs:sequence>
+             <xs:element name="item" type="internal_panel_type" minOccurs="1" maxOccurs="unbounded"/> <!-- internal panels in allocation order! -->
+           </xs:sequence>
+         <xs:attribute   name="stage"     type="stage_number"  default="1" />          <!-- From FD21.00.003 -->
+         <xs:attribute   name="end_stage" type="stage_data"    default="last_stage" /> <!-- From FD22 -->
+         </xs:complexType>
+      </xs:element>
+
+      <xs:choice>
+          <!-- From FD19, for all timber (orthotropic/CLT/GLC) panels! -->
+        <xs:element name="timber_application_data" >
+           <xs:complexType>
+             <xs:sequence>
+               <xs:element name="factors"                     type="timber_factors_type" minOccurs="0" maxOccurs="1" /> <!-- Required for orthotropic/CLT panels! -->
+             </xs:sequence>
+             <xs:attribute      name="panel_type"             type="guidtype"         use="required" />
+             <xs:attribute      name="shear_coupling"         type="xs:boolean"       default="true" /> <!-- only for CLT/GLC panels -->
+             <xs:attribute      name="glued_narrow_sides"     type="xs:boolean"       default="true" /> <!-- only for CLT panels     -->
+             <xs:anyAttribute   processContents="skip"/>
+           </xs:complexType>
+        </xs:element>
+        <!-- From FD17, for hollowcore panels -->
+        <xs:element name="camber_simulation"                  type="camber_type"      minOccurs="0" maxOccurs="1" />
+      </xs:choice>
+
+      <xs:choice>
+        <xs:sequence>
+          <xs:element name="internal_plastic_limit_forces"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="internal_plastic_limit_moments" type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="external_plastic_limit_forces"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="external_plastic_limit_moments" type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="internal_stiffness"             type="stiffness_with_friction" />
+          <xs:element name="external_stiffness"             type="stiffness_with_friction" />
+        </xs:sequence>
+        <!-- new choice from FD18 -->
+        <xs:sequence>
+          <xs:choice>  <!-- it needs only for 'Panel' Analytical model  -->
+            <xs:element name="internal_rigidity"              type="rigidity_data_type3" minOccurs="0" maxOccurs="1" />
+            <xs:element name="internal_predefined_rigidity"   type="reference_type"      minOccurs="0" maxOccurs="1" />
+            <!-- new choice from FD20 -->
+            <xs:element name="internal_rigidity_group"        type="rigidity_group_type3" minOccurs="0" maxOccurs="1" />
+          </xs:choice>
+
+          <xs:choice>  <!-- it needs for all type of panels             -->
+            <xs:element name="external_rigidity"              type="rigidity_data_type3" />
+            <xs:element name="external_predefined_rigidity"   type="reference_type" />
+            <!-- new choice from FD20 -->
+            <xs:element name="external_rigidity_group"        type="rigidity_group_type3" />
+          </xs:choice>
+
+        </xs:sequence>
+      </xs:choice>
+
+      <xs:element name="colouring"  type="entity_color"  minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+
+<!--      <xs:any minOccurs="0" maxOccurs="unbounded" /> -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="type"                  type="paneltype"         use="required"  />
+    <xs:attribute      name="complex_material"      type="guidtype"          use="optional"  /> <!-- but required for hollowcore panels! -->
+    <xs:attribute      name="complex_section"       type="guidtype"          use="optional"  /> <!-- but required for hollowcore panels! -->
+    <xs:attribute      name="name"                  type="identifier"        default=""      />
+    <xs:attribute      name="panelname"             type="xs:string"         use="optional"  />
+    <xs:attribute      name="in_situ_fabricated"    type="xs:boolean"        default="false" /> <!-- From FD14 -->
+    <xs:attribute      name="gap"                   type="xs:double"         use="required"  /> <!-- Import's AUTOCORRECTION: always 0.0 in cases of 'in_situ_fabricated' panels -->
+    <xs:attribute      name="orthotropy"            type="orthotropy_type"   default="1.0"   /> <!-- Import's AUTOCORRECTION: always default in cases of 'in_situ_fabricated' panels -->
+    <xs:attribute      name="thickness"             type="xs:double"         use="required"  /> <!-- hollowcore panels: import/export, timber panels: export only -->
+    <xs:attribute      name="alignment"             type="ver_align"         use="required"  />
+    <xs:attribute      name="align_offset"          type="xs:double"         use="optional"  />
+    <xs:attribute      name="ecc_calc"              type="xs:boolean"        default="false" />
+    <xs:attribute      name="ecc_crack"             type="xs:boolean"        default="false" /> <!-- valid only for hollowcore panels -->
+    <xs:attribute      name="internal_moving_local" type="xs:boolean"        default="false" /> <!-- needs only for 'Panel' Analytical model  -->
+    <xs:attribute      name="external_moving_local" type="xs:boolean"        default="false" />
+    <xs:attribute      name="forced_plate"          type="xs:boolean"        default="false" /> <!-- From FD14; ONLY FOR standing slabs! -->
+    <xs:attribute      name="panel_width"           type="positive_max_100"  default="1.5"   /> <!-- From FD18; valid only for timber panels! -->
+    <xs:attribute      name="panel_type"            type="guidtype"          use="optional"  /> <!-- Only for FD18's timber panels (this is part of timber_data element from FD19) -->
+    <xs:attribute      name="ignored_distance"      type="non_neg_max_10000" default="0.02"  /> <!-- From FD19.00.005; only for hollowcore panels -->
+    <xs:attribute      name="ignored_in_stability"  type="xs:boolean"        default="false" /> <!-- From FD19.00.006; only for hollowcore panels -->
+    <xs:attribute      name="stage"                 type="stage_number"      default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"             type="stage_data"        default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--=============  Edge Connection types  ==========================================-->
+  <xs:attributeGroup name="ec_attribs">
+    <xs:attribute    name="moving_local"       type="xs:boolean"       default="false" />
+    <xs:attribute    name="joined_start_point" type="xs:boolean"       default="false" />
+    <xs:attribute    name="joined_end_point"   type="xs:boolean"       default="false" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="ec_type">
+    <xs:choice>
+      <xs:sequence> <!-- custom edge connection type, the only EC type before FD18 -->
+        <xs:element name="stiffness"              type="stiffness_with_friction" />
+        <xs:element name="plastic_limit_forces"   type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+        <xs:element name="plastic_limit_moments"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+      </xs:sequence>
+      <!-- new choices from FD18 -->
+      <xs:element   name="rigidity"               type="rigidity_data_type3" />
+      <xs:element   name="predefined_rigidity"    type="reference_type" />
+      <!-- new choice from FD20 -->
+      <xs:element   name="rigidity_group"         type="rigidity_group_type3"/>
+    </xs:choice>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                type="identifier"         default="CE" />
+    <xs:attributeGroup ref="ec_attribs" />
+    <xs:attribute      name="stage"               type="stage_number"       default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"           type="stage_data"         default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- connected edge list item from FD18 -->
+  <xs:complexType name="ec_edge_list_item_type">
+    <xs:sequence>
+       <xs:element name="edge_connection"         type="ec_type"   />
+    </xs:sequence>
+    <xs:attribute    name="edge_index"            type="xs:unsignedShort"   use="required" />
+    <xs:anyAttribute processContents="skip" />
+  </xs:complexType>
+
+  <!--====  Unified library types (rigidity, timber panel etc.), from FD18  =========================-->
+  <xs:attributeGroup name="lib_base_attribs" >
+    <xs:attribute      name="name"                type="name40"             use="required" />
+    <xs:attributeGroup ref ="entity_attribs" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="rigidity_data_type0">
+    <xs:sequence>
+      <xs:element   name="motions"                type="stiffness_type" />
+      <xs:element   name="plastic_limit_forces"   type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_data_type1">
+    <xs:complexContent>
+      <xs:extension   base="rigidity_data_type0">
+        <xs:attribute name="detach"               type="detach_type"        default="" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="pile_rigidity_group_type">
+    <xs:sequence>
+      <xs:element name="springs"                  type="stiffness_motion_record"    minOccurs="10" maxOccurs="10" />
+      <xs:element name="plastic_limits"           type="plasticity3d_force_record"  minOccurs="10" maxOccurs="10" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="pile_rigidity_group_type1">
+    <xs:sequence>
+        <xs:element name="spring"                type="stiff_base_type" />
+        <xs:element name="plastic_limit_forces"  type="plasticity_type" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="pile_rigidity_group_type2">
+    <xs:sequence>
+        <xs:element name="spring"                type="stiff_base_type"             minOccurs="10" maxOccurs="10" />
+        <xs:element name="plastic_limit_forces"  type="plasticity_type"             minOccurs="10" maxOccurs="10" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_group_type0">
+    <xs:sequence>
+      <xs:element name="springs"                  type="stiffness_motion_record"    minOccurs="10" maxOccurs="10" />
+      <xs:element name="plastic_limits"           type="plasticity3d_force_record"  minOccurs="4"  maxOccurs="4" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_group_type1">
+    <xs:complexContent>
+      <xs:extension   base="rigidity_group_type0">
+        <xs:attribute name="detach"               type="detach_type"        default="" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_datalib_type1">
+    <xs:choice>
+      <xs:element name="rigidity"                 type="rigidity_data_type1" />
+      <!-- choice from FD20 -->
+      <xs:element name="rigidity_group"           type="rigidity_group_type1" />
+    </xs:choice>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType> <!--_____________________________________________________________________________-->
+
+  <xs:complexType name="rigidity_data_type2">
+    <xs:complexContent>
+      <xs:extension base="rigidity_data_type1">
+        <xs:sequence>
+          <xs:element name="rotations"             type="stiffness_type" />
+          <xs:element name="plastic_limit_moments" type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_group_type2">
+    <xs:sequence>
+      <xs:element name="springs"                  type="stiffness_record"    minOccurs="10" maxOccurs="10" />
+      <xs:element name="plastic_limits"           type="plasticity3d_record" minOccurs="4"  maxOccurs="4" />
+    </xs:sequence>
+    <xs:attribute   name="detach"                 type="detach_type"        default="" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_datalib_type2">
+    <xs:choice>
+      <xs:element name="rigidity"                type="rigidity_data_type2" />
+      <!-- choice from FD20 -->
+     <xs:element name="rigidity_group"           type="rigidity_group_type2" />
+    </xs:choice>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType> <!--_____________________________________________________________________________-->
+
+  <xs:complexType name="rigidity_data_type3">
+    <xs:complexContent>
+      <xs:extension base="rigidity_data_type2">
+        <xs:attribute name="friction"              type="reduction_factor_type" default="0.3" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_group_type3">
+    <xs:complexContent>
+      <xs:extension base="rigidity_group_type2">
+        <xs:attribute name="friction"              type="reduction_factor_type" default="0.3" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:complexType name="rigidity_datalib_type3">
+    <xs:choice>
+      <xs:element name="rigidity"                 type="rigidity_data_type3" />
+      <!-- choice from FD20 -->
+      <xs:element name="rigidity_group"           type="rigidity_group_type3" />
+    </xs:choice>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType> <!--_____________________________________________________________________________-->
+
+  <!-- Timber panel types -->
+
+  <xs:attributeGroup name="service_class_items">
+    <xs:attribute name="kdef"               type="positive_max_1e5"   use="required" />
+    <xs:attribute name="kmod_permanent"     type="positive_max_1e5"   use="required" />
+    <xs:attribute name="kmod_long_term"     type="positive_max_1e5"   use="required" />
+    <xs:attribute name="kmod_medium_term"   type="positive_max_1e5"   use="required" />
+    <xs:attribute name="kmod_short_term"    type="positive_max_1e5"   use="required" />
+    <xs:attribute name="kmod_instantaneous" type="positive_max_1e5"   use="required" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="service_class_factors">
+    <xs:attributeGroup ref="service_class_items" />
+    <xs:anyAttribute                        processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="service_class_kdefs">
+    <xs:attribute name="service_class_0"    type="non_neg_max_1e5"    use="required" />
+    <xs:attribute name="service_class_1"    type="non_neg_max_1e5"    use="required" />
+    <xs:attribute name="service_class_2"    type="non_neg_max_1e5"    use="required" />
+    <xs:anyAttribute                        processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="tp_datatype">
+    <xs:sequence>
+      <xs:element name="stiffness" >
+        <xs:complexType>
+          <xs:attribute name="Em_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Em_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Et_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Et_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Ec_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Ec_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Gr_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Gr_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="Gv_k"               type="positive_max_1e5"   use="required" />
+          <xs:attribute name="rho"                type="positive_max_1e5"   use="required" />
+          <xs:anyAttribute                        processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="strength" >
+        <xs:complexType>
+          <xs:attribute name="fm_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fm_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="ft_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="ft_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fc_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fc_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fr_k0"              type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fr_k90"             type="positive_max_1e5"   use="required" />
+          <xs:attribute name="fv_k"               type="positive_max_1e5"   use="required" />
+          <xs:anyAttribute                        processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="service_class_0_factors" type="service_class_factors" />
+      <xs:element name="service_class_1_factors" type="service_class_factors" />
+      <xs:element name="service_class_2_factors" type="service_class_factors" />
+    </xs:sequence>
+    <xs:attribute      name="description"    type="name40"                   use="required" />
+    <xs:attribute      name="thickness"      type="timber_panel_thickness"   use="required" />
+    <xs:attributeGroup ref="old_orthotropic_appdata" /> <!-- Required only for FD18's simple timber panels (this is part of timber_data element from FD19) -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:attributeGroup name="mech_props" >
+    <xs:attribute name="material"  type="name256"           use="required" />
+    <xs:attribute name="thickness" type="positive_max_1"    use="required" />
+    <xs:attribute name="theta"     type="one_quadrant"      use="required" />
+    <xs:attribute name="Ex"        type="positive_max_1e17" use="required" />
+    <xs:attribute name="Ey"        type="non_neg_max_1e17"  use="required" />
+    <xs:attribute name="nuxy"      type="non_neg_max_10"    use="required" />
+    <xs:attribute name="Gxy"       type="positive_max_1e17" use="required" />
+    <xs:attribute name="Gxz"       type="positive_max_1e17" use="required" />
+    <xs:attribute name="Gyz"       type="positive_max_1e17" use="required" />
+    <xs:attribute name="rho"       type="positive_max_1e20" use="required" />
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="limit_stresses" >
+    <xs:attribute name="fm0k"      type="positive_max_1e17" use="required" />
+    <xs:attribute name="fm90k"     type="non_neg_max_1e17"  use="required" /> <!-- From FD22.00.002: from positive_max_1e17 to non_neg_max_1e17 -->
+    <xs:attribute name="ft0k"      type="positive_max_1e17" use="required" />
+    <xs:attribute name="ft90k"     type="positive_max_1e17" use="required" />
+    <xs:attribute name="fc0k"      type="positive_max_1e17" use="required" />
+    <xs:attribute name="fc90k"     type="positive_max_1e17" use="required" />
+    <xs:attribute name="fxyk"      type="positive_max_1e17" use="required" />
+    <xs:attribute name="fvk"       type="positive_max_1e17" use="required" />
+    <xs:attribute name="fRk"       type="positive_max_1e17" use="required" />
+    <xs:attribute name="fTork"     type="positive_max_1e17" use="required" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="glc_layer">
+    <xs:attributeGroup ref="mech_props" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="clt_layer">
+    <xs:attributeGroup ref="mech_props" />
+    <xs:attributeGroup ref="limit_stresses" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="glc_datatype">
+    <xs:sequence>
+      <xs:element name="layer"             type="glc_layer"  minOccurs="1" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute      name="group"        type="name40"     use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="clt_datatype">
+    <xs:sequence>
+     <xs:element name="default_kdef"       type="service_class_kdefs" />
+     <xs:element name="layer"              type="clt_layer"          minOccurs="1" maxOccurs="unbounded"/>
+    </xs:sequence>
+    <xs:attribute      name="manufacturer" type="name40"             use="required" />
+    <xs:attribute      name="r33"          type="clt_srf"            use="required" />
+    <xs:attribute      name="r66"          type="clt_srf"            use="required" />
+    <xs:attribute      name="r77"          type="clt_srf"            use="required" />
+    <xs:attribute      name="r88"          type="clt_srf"            use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="timberpanel_lib_type">
+    <xs:sequence>
+      <xs:element name="timber_panel_data" type="tp_datatype" />
+    </xs:sequence>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="glcpanel_lib_type">
+    <xs:sequence>
+      <xs:element name="glc_panel_data"    type="glc_datatype" />
+    </xs:sequence>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="cltpanel_lib_type">
+    <xs:sequence>
+      <xs:element name="clt_panel_data"    type="clt_datatype" />
+    </xs:sequence>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+  <!--_____________________________________________________________________________-->
+
+
+  <!--=====  Connected items  ======================================================================-->
+  <!--connected points type-->
+  <xs:complexType name="connected_points_type">
+    <xs:sequence>
+      <xs:element name="point"                      type="point_type_3d"      minOccurs="2" maxOccurs="2" />
+      <xs:element name="local_x"                    type="point_type_3d" />
+      <xs:element name="local_y"                    type="point_type_3d" />
+      <xs:choice>
+        <xs:sequence>
+          <xs:element name="stiffness"              type="simple_stiffness_type" />
+          <xs:element name="plastic_limit_forces"   type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="plastic_limit_moments"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+        </xs:sequence>
+        <!-- new choices from FD18 -->
+        <xs:element   name="rigidity"               type="rigidity_data_type2"/>
+        <xs:element   name="predefined_rigidity"    type="reference_type"/>
+        <!-- new choice from FD20 -->
+        <xs:element   name="rigidity_group"         type="rigidity_group_type2"/>
+      </xs:choice>
+      <xs:element     name="ref"                    type="reference_type"     minOccurs="0" maxOccurs="unbounded" />
+      <xs:element     name="colouring"              type="entity_color"       minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                  type="identifier"         default="CP" />
+    <xs:attribute      name="interface"             type="xs:double"          default="0.5" />
+    <xs:attribute      name="stage"                 type="stage_number"       default="1" />                  <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"             type="stage_data"         default="last_stage" />         <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--connected lines type-->
+  <xs:complexType name="connected_lines_type">
+    <xs:sequence>
+      <xs:element name="edge"                       type="edge_type"          minOccurs="2" maxOccurs="2" />
+      <xs:element name="point"                      type="point_type_3d"      minOccurs="0" />
+      <xs:element name="local_x"                    type="point_type_3d" />
+      <xs:element name="local_y"                    type="point_type_3d" />
+      <xs:choice>
+        <xs:sequence>
+          <xs:element name="stiffness"              type="simple_stiffness_type" />
+          <xs:element name="plastic_limit_forces"   type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+          <xs:element name="plastic_limit_moments"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+        </xs:sequence>
+        <!-- new choices from FD18 -->
+        <xs:element   name="rigidity"               type="rigidity_data_type3"/>
+        <xs:element   name="predefined_rigidity"    type="reference_type"/>
+        <!-- new choice from FD20 -->
+        <xs:element   name="rigidity_group"         type="rigidity_group_type3"/>
+      </xs:choice>
+      <xs:element     name="ref"                    type="reference_type"     minOccurs="0" maxOccurs="unbounded" />
+      <xs:element     name="colouring"              type="entity_color"       minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                  type="identifier"         default="CL" />
+    <xs:attribute      name="moving_local"          type="xs:boolean"         default="false" />
+    <xs:attribute      name="interface_start"       type="xs:double"          default="0.5" />
+    <xs:attribute      name="interface_end"         type="xs:double"          default="0.5" />
+    <xs:attribute      name="stage"                 type="stage_number"       default="1" />                  <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"             type="stage_data"         default="last_stage" />         <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--surface connection type-->
+  <xs:complexType name="surface_connection_type">
+    <xs:sequence>
+      <xs:element     name="region"                 type="region_type" />
+      <xs:choice>
+        <xs:element   name="rigidity"               type="rigidity_data_type1"/>
+        <xs:element   name="predefined_rigidity"    type="reference_type"/>
+        <!-- choice from FD20 -->
+        <xs:element   name="rigidity_group"         type="rigidity_group_type1"/>
+      </xs:choice>
+      <xs:element     name="ref"                    type="reference_type"     minOccurs="0" maxOccurs="unbounded" />
+      <xs:element     name="local_system"           type="opt_localsys_type"  minOccurs="0" maxOccurs="1" /> <!-- From FD19.00.004 -->
+      <xs:element     name="colouring"              type="entity_color"       minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                  type="identifier"         default="CS"    />
+    <xs:attribute      name="distance"              type="abs_max_10000"      default="0" />
+    <xs:attribute      name="interface"             type="xs:double"          default="0" />
+    <xs:attribute      name="stage"                 type="stage_number"       default="1" />                  <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"             type="stage_data"         default="last_stage" />         <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--==========  Virtual objects  =======================================================-->
+  <!--virtual bar type-->
+  <xs:complexType name="virtual_bar_type">
+    <xs:sequence>
+      <xs:element name="edge"            type="edge_type" />                                        <!-- From FD21, only "line" used for trusses -->
+      <xs:element name="local-y"         type="point_type_3d" />
+      <xs:element name="connectivity"    type="connectivity_type"      minOccurs="0" maxOccurs="2" />
+      <xs:element name="truss_behaviour" type="simple_truss_chr_type"  minOccurs="0" maxOccurs="1" />   <!-- From FD21, used only for trusses -->
+      <xs:element name="colouring"       type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"      type="identifier"          default="BF"   />
+    <xs:attribute      name="AE"        type="virtbar_data_range"  use="required" />
+    <xs:attribute      name="unit_mass" type="non_neg_max_1e7"     default="0.0"  /> <!-- From FD21 -->
+
+    <xs:attribute      name="ItG"       type="virtbar_data_range"  default="1E07" /> <!-- it is not used in the case of trusses -->
+    <xs:attribute      name="I1E"       type="virtbar_data_range"  default="1E07" /> <!-- it is not used in the case of trusses -->
+    <xs:attribute      name="I2E"       type="virtbar_data_range"  default="1E07" /> <!-- it is not used in the case of trusses -->
+    <xs:attribute      name="stage"     type="stage_number"        default="1" />    <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage" type="stage_data"          default="last_stage"/> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--virtual shell type-->
+  <xs:complexType name="virtual_shell_type">
+    <xs:sequence>
+      <xs:element name="region"             type="region_type" />
+      <xs:element name="local_pos"          type="point_type_3d" />
+      <xs:element name="local_x"            type="point_type_3d" />
+      <xs:element name="local_y"            type="point_type_3d" />
+      <xs:element name="membrane_stiffness" type="stiffness_matrix_4_type" />
+      <xs:element name="flexural_stiffness" type="stiffness_matrix_4_type" />
+      <xs:element name="shear_stiffness"    type="stiffness_matrix_2_type" />
+      <xs:element name="colouring"          type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                         type="identifier"        default="FS" />
+    <xs:attribute      name="density"                      type="non_neg_max_1e20"  use="required" />
+    <xs:attribute      name="t1"                           type="positive_max_1e20" use="required" />
+    <xs:attribute      name="t2"                           type="positive_max_1e20" use="required" />
+    <xs:attribute      name="alfa_1"                       type="positive_max_1e20" use="required" />
+    <xs:attribute      name="alfa_2"                       type="positive_max_1e20" use="required" />
+    <xs:attribute      name="mesh_size"                    type="non_neg_max_1e20"  default="0.0" />   <!-- average surface element size -->
+    <xs:attribute      name="ignore_in_st_imp_calculation" type="xs:boolean"        default="false" /> <!-- From FD19 -->
+    <xs:attribute      name="stage"                        type="stage_number"      default="1" />     <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"                    type="stage_data"        default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute processContents="skip"/>
+  </xs:complexType>
+
+  <!-- diaphragm type,  from FD18 -->
+  <xs:complexType name="diaphragm_type">
+    <xs:sequence>
+      <xs:element name="region"             type="region_type" />
+      <xs:element name="colouring"          type="entity_color" minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"          type="identifier"   default="FS" />
+    <xs:attribute      name="stage"         type="stage_number" default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"     type="stage_data"   default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute processContents="skip"/>
+  </xs:complexType>
+
+  <!--storey type-->
+  <xs:complexType name="storey_type">
+    <xs:sequence>
+      <xs:element name="origo"       type="point_type_3d" />
+      <xs:element name="direction"   type="point_type_2d" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="dimension_x" type="positive_double" use="required" />
+    <xs:attribute      name="dimension_y" type="positive_double" use="required" />
+    <xs:attribute      name="name"        type="nameMax256"      use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--refplane type-->
+  <xs:complexType name="refplane_type">
+    <xs:sequence>
+      <xs:element name="region"      type="region_type" />
+      <xs:element name="colouring"   type="entity_color"         minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"        type="name256"  default="A" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- labsecgeom_type -->
+  <xs:complexType name="labsecgeom_type">
+    <xs:choice>
+        <xs:element name="line_segment" >
+           <xs:complexType>
+             <xs:sequence>
+               <xs:element name="start_point"                 type="point_type_3d" />
+               <xs:element name="base_point"                  type="point_type_3d" />
+               <xs:element name="end_point"                   type="point_type_3d" />
+             </xs:sequence>
+             <xs:attribute      name="reverse_direction"      type="xs:boolean"       default="false" />
+             <xs:anyAttribute   processContents="skip"/>
+           </xs:complexType>
+        </xs:element>
+        <xs:element name="polyline" >
+           <xs:complexType>
+             <xs:sequence>
+               <xs:element name="point"                       type="point_type_3d"    minOccurs="3" maxOccurs="unbounded" />
+             </xs:sequence>
+           </xs:complexType>
+        </xs:element>
+    </xs:choice>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"        type="identifier"  default="A" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- respoint_type -->
+  <xs:complexType name="respoint_type">
+    <xs:sequence>
+        <xs:element name="position" type="point_type_3d" />
+        <xs:element name="font"     type="font_type"    minOccurs="0" maxOccurs="1" />   <!-- NOT USED from FD23! -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"        type="identifier"  default="PT" />
+    <xs:attribute      name="base_entity" type="guidtype"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--dim_x_type-->
+  <xs:complexType name="dim_x_type">
+    <xs:sequence />
+    <xs:attribute name="x" type="xs:double" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+   <!--dim_y_type-->
+  <xs:complexType name="dim_y_type">
+    <xs:sequence />
+    <xs:attribute name="y" type="xs:double" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+   <!--axis label type-->
+  <xs:complexType name="axis_label_props">
+    <xs:sequence >
+      <xs:element name="font"     type="font_type" />
+    </xs:sequence >
+    <xs:attribute name="colour"   type="rgb_color_type" use="required" />
+    <xs:attribute name="penwidth" type="abs_max_1000"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--axis type-->
+  <xs:complexType name="axis_type">
+    <xs:sequence>
+      <xs:element name="start_point"   type="point_type_2d" />
+      <xs:element name="end_point"     type="point_type_2d" />
+      <xs:element name="label_props"   type="axis_label_props"   minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+      <xs:element name="colouring"     type="entity_color"       minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="prefix"       type="string15"      default="" />
+    <xs:attribute      name="id"           type="axis_limit"    use="required"/>
+    <xs:attribute      name="id_is_letter" type="xs:boolean"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+  <!--tnode type-->
+
+
+  <!-- ====  Polyhedrons (TSolids) and it's subtypes ================================ -->
+
+  <!--Fillcolor attributes for polyhedrons and foundations are not implemented yet.
+      These three attributes are needed for the graphical representation exclusively,
+      you do not have to implement these to the analythical models -->
+
+  <xs:complexType name="ts_vertex_type">
+    <xs:sequence>
+      <!-- WARNING: points are in index order! -->
+      <xs:element name="vertex"    type="point_type_3d"          minOccurs="4" maxOccurs="32767" />
+    </xs:sequence>
+  </xs:complexType>
+    <!--tline type-->
+
+  <xs:complexType name="ts_indexed_vertex_type">
+    <xs:attribute name="index"     type="xs:unsignedShort"       use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ts_visible_edge_type">
+    <xs:sequence>
+      <xs:element name="vertex"    type="ts_indexed_vertex_type" minOccurs="1" maxOccurs="32767" />
+    </xs:sequence>
+    <xs:attribute name="linetype"  type="visiblelinetype"        default="line" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ts_contourline_type">
+    <xs:sequence>
+      <xs:element name="vertex"    type="ts_indexed_vertex_type" minOccurs="3" maxOccurs="32767" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="ts_contour_type">
+    <xs:sequence>
+      <xs:element name="contour"   type="ts_contourline_type"    minOccurs="1" maxOccurs="32767" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="ts_surface_type">
+    <xs:sequence>
+      <xs:element name="flat_face" type="ts_contour_type"        minOccurs="1" maxOccurs="32767" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--polyhedron type-->
+  <xs:complexType name="polyhedron_type">
+    <xs:sequence>
+      <xs:element name="vertices_in_index_order"  type="ts_vertex_type"       minOccurs="1" maxOccurs="1" />
+      <xs:element name="visible_edge"             type="ts_visible_edge_type" minOccurs="0" maxOccurs="32767" />
+      <xs:element name="surface"                  type="ts_surface_type"      minOccurs="1" maxOccurs="32767" />
+    </xs:sequence>
+    <xs:attributeGroup ref="fillcolor_attribs" /> <!-- NOT IMPLEMENTED YET! -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+  <!-- ==  End of polyhedron types  ======================================= -->
+
+  <!-- ===  Foundations and its subtypes  ================================= -->
+  <!-- Foundations' spec. attribs -->
+  <xs:attributeGroup name="foundation_attribs">
+    <xs:attribute name="name"                  type="identifier"          default="F" />
+    <xs:attribute name="bedding_modulus"       type="positive_max_1e8"    default="10000" /> <!-- In case of foundation slabs this is the vertical (z) component -->
+  </xs:attributeGroup>
+
+  <!-- referable internal parts -->
+  <xs:complexType name="lnfoundation_ref_type">
+    <xs:attribute name="ref_wall"           type="guidtype"     use="required"/>
+    <xs:attribute name="ref_slab"           type="guidtype"     use="optional"/>
+    <xs:attribute name="ref_support"        type="guidtype"     use="optional"/>
+    <xs:attribute name="supports_stage"     type="stage_number" default="1"/>           <!-- From FD21.00.003 -->
+    <xs:attribute name="supports_end_stage" type="stage_data"   default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptfoundation_ref_type">
+    <xs:attribute name="ref_slab"           type="guidtype"      use="optional"/>
+    <xs:attribute name="ref_support"        type="guidtype"      use="optional"/>
+    <xs:attribute name="supports_stage"     type="stage_number"  default="1"/>           <!-- From FD21.00.003 -->
+    <xs:attribute name="supports_end_stage" type="stage_data"    default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="sffoundation_ref_type">
+    <xs:attribute name="ref_slab"           type="guidtype"      use="required"/>
+    <xs:attribute name="ref_support"        type="guidtype"      use="optional"/>
+    <xs:attribute name="supports_stage"     type="stage_number"  default="1"/>           <!-- From FD21.00.003 -->
+    <xs:attribute name="supports_end_stage" type="stage_data"    default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name = "plinth_data">  <!-- From FD21 -->
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.1"/>
+      <xs:maxInclusive value="10000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name = "foundation_thickness_data"> <!-- From FD21 -->
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0.0001"/>
+      <xs:maxInclusive value="10000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="foundation_plinth_type">
+    <xs:attribute name="a"      type="plinth_data"    use="required"/>
+    <xs:attribute name="b"      type="plinth_data"    use="required"/>
+    <xs:attribute name="h"      type="plinth_data"    use="required"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="extruded_foundation_type">
+    <xs:sequence>
+      <xs:element name="region"          type="region_type" />
+      <xs:element name="cuboid_plinth"   type="foundation_plinth_type" minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute name="thickness"       type="positive_max_10000"     use="required"/>
+    <xs:attribute name="above"           type="xs:boolean"             default="false"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- foundations' insulation -->
+  <xs:complexType name="foundation_insulation_type">
+    <xs:attribute name="e_modulus"     type="positive_max_1e20"        use="required"/>
+    <xs:attribute name="thickness"     type="foundation_thickness_data" use="required"/>
+    <xs:attribute name="density"       type="positive_max_1e20"        use="required"/>
+    <xs:attribute name="gamma_m_u"     type="from_1_to_1e8"            default="1.2" />
+    <xs:attribute name="gamma_m_uas"   type="from_1_to_1e8"            default="1.0" />
+    <xs:attribute name="limit_stress"  type="from_1_to_1e8"            default="1.0" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ptfoundation type-->
+  <xs:complexType name="ptfoundation_type">
+    <xs:sequence>
+      <xs:element name="connection_point"   type="point_type_3d"              minOccurs="1" maxOccurs="1" />
+      <xs:element name="direction"          type="point_type_3d"              minOccurs="1" maxOccurs="1" />
+      <xs:choice>
+        <xs:element name="polyhedron"       type="polyhedron_type"            minOccurs="1" maxOccurs="1" />
+        <!--  the other choice from FD15.1:  -->
+        <xs:element name="extruded_solid"   type="extruded_foundation_type"   minOccurs="1" maxOccurs="1" />
+      </xs:choice>
+      <xs:element name="referable_parts"    type="ptfoundation_ref_type"      minOccurs="0" maxOccurs="1" />
+      <xs:element name="insulation"         type="foundation_insulation_type" minOccurs="0" maxOccurs="1" /> <!-- From FD15 -->
+      <xs:element name="colouring"          type="entity_color"               minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref ="entity_attribs" />
+    <xs:attributeGroup ref ="foundation_attribs"/>
+    <xs:attribute      name="analythical_system"          type="foundationsystems_type" default="simple" />
+    <xs:attribute      name="complex_material"            type="guidtype"               use="required"/>
+    <xs:attributeGroup ref ="fillcolor_attribs" /> <!-- NOT IMPLEMENTED YET! -->
+    <xs:attribute      name="slabs_stage"                 type="stage_number"           default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="slabs_end_stage"             type="stage_data"             default="last_stage" /> <!-- From FD22 -->
+    <xs:attribute      name="point_connections_stage"     type="stage_number"           default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="point_connections_end_stage" type="stage_data"             default="last_stage" /> <!-- From FD22 -->
+    <xs:attribute      name="stage"                       type="stage_number"           default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"                   type="stage_data"             default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- lnfoundation type-->
+  <xs:complexType name="lnfoundation_type">
+    <xs:sequence>
+      <xs:element name="bar_part"           type="bar_part_type"              minOccurs="1" maxOccurs="1" />
+      <xs:element name="referable_parts"    type="lnfoundation_ref_type"      minOccurs="0" maxOccurs="1" />
+      <xs:element name="insulation"         type="foundation_insulation_type" minOccurs="0" maxOccurs="1" /> <!-- From FD15 -->
+      <xs:element name="colouring"          type="entity_color"               minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref ="entity_attribs" />
+    <xs:attributeGroup ref ="foundation_attribs"/>
+    <xs:attribute      name="analythical_system"  type="foundationsystems_type" default="simple" />
+    <xs:attributeGroup ref ="fillcolor_attribs" /> <!-- NOT IMPLEMENTED YET! -->
+    <xs:attribute      name="stage"               type="stage_number"           default="1" />               <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"           type="stage_data"             default="last_stage" />      <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- sffoundation type-->
+  <xs:complexType name="sffoundation_type">
+    <xs:sequence>
+      <xs:element name="slab_part"          type="slab_part_type"             minOccurs="1" maxOccurs="1" />
+      <xs:element name="referable_parts"    type="sffoundation_ref_type"      minOccurs="0" maxOccurs="1" />
+      <xs:element name="insulation"         type="foundation_insulation_type" minOccurs="0" maxOccurs="1" /> <!-- From FD15 -->
+      <xs:element name="colouring"          type="entity_color"               minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref ="foundation_attribs"/>
+    <xs:attribute      name="analythical_system" type="slabfoundationsystems_type"  default="surface_support_group" />
+    <xs:attributeGroup ref="fillcolor_attribs" /> <!-- NOT IMPLEMENTED YET! -->
+    <xs:attribute      name="bedding_modulus_x"  type="positive_max_1e8"      use="optional" />      <!-- From FD17, the horizontal x component -->
+    <xs:attribute      name="bedding_modulus_y"  type="positive_max_1e8"      use="optional" />      <!-- From FD17, the horizontal y component -->
+    <xs:attribute      name="stage"              type="stage_number"          default="1" />         <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"          type="stage_data"            default="last_stage"/> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- foundation type-->
+  <xs:complexType name="foundation_type">
+    <xs:sequence>
+      <xs:element name="isolated_foundation" type="ptfoundation_type" minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="wall_foundation"     type="lnfoundation_type" minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="foundation_slab"     type="sffoundation_type" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+  <!-- ==  End of FOUNDATION types  =================================== -->
+
+  <!-- ===  Soil and its subtypes   =================================== -->
+  <xs:simpleType name="depth_level_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1000000"/>
+      <xs:maxExclusive value="0.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="level_point_depth">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-100000"/>
+      <xs:maxInclusive value="+100000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="piletype_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="driven_displacement"/>
+      <xs:enumeration value="driven_jetted"/>
+      <xs:enumeration value="bored"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="level_point_type">
+    <xs:attributeGroup ref= "coord2d"/>
+    <xs:attribute      name="z_top"      type="level_point_depth" use="required" />
+    <xs:attribute      name="z_bottom"   type="level_point_depth" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="horizontal_polygon_2d">
+    <xs:sequence>
+      <xs:element name="point"             type="point_type_2d"  minOccurs="3" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="height"            type="xs:double"      default="0.0" /> <!-- From FD20.00.004 -->
+  </xs:complexType>
+
+  <xs:complexType name="stratum_type">
+    <xs:attribute name="material"          type="guidtype"          use="required" />
+    <xs:attribute name="colour"            type="rgb_color_type"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="water_level_type">
+    <xs:attribute name="colour"            type="rgb_color_type"    use="required" />
+    <xs:attribute name="name"              type="name256"           use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="strata_type">
+    <xs:sequence>
+      <xs:element name="contour"                 type="horizontal_polygon_2d" />
+      <xs:element name="stratum"                 type="stratum_type"      minOccurs="1" maxOccurs="100" />
+      <xs:element name="water_level"             type="water_level_type"  minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="name"                    type="identifier"        use="optional" />
+    <xs:attribute name="last_change"             type="xs:dateTime"       use="required" />
+    <xs:attribute name="action"                  type="modification_type" use="required" />
+    <xs:attribute name="default_filling"         type="guidtype"          use="optional" />       <!-- "optional" (from FD21.00.006) only for old FD12/13 models, otherwise "required" -->
+    <xs:attribute name="default_fillings_colour" type="rgb_color_type"    default="B97A57" />
+    <xs:attribute name="depth_level_limit"       type="depth_level_type"  use="required" />
+    <xs:attribute name="stage"                   type="stage_number"      default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute name="end_stage"               type="stage_data"        default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="filling_type">
+    <xs:sequence>
+      <xs:element name="contour"                type="horizontal_polygon_2d" />
+      <xs:element name="level_point"            type="level_point_type"  minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="default_top_level"      type="level_point_depth" use="required" />
+    <xs:attribute name="default_bottom_level"   type="level_point_depth" use="required" />
+    <xs:attribute name="material"               type="guidtype"          use="required" />
+    <xs:attribute name="colour"                 type="rgb_color_type"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="piles_beam_type">
+    <xs:sequence>
+      <xs:element name="curve"        type="edge_type" />
+      <xs:element name="local-y"      type="point_type_3d" />
+      <xs:element name="connectivity" type="connectivity_type" />
+      <xs:element name="buckling_data" type="buckling_data_type"   minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute      name="complex_material"  type="guidtype"      use="optional" />  <!-- But required for non-composite bars! -->
+    <xs:attribute      name="complex_section"   type="guidtype"      use="optional" />  <!-- But required for non-composite bars! -->
+    <xs:attribute      name="complex_composite" type="guidtype"      use="optional" />  <!-- But required for composite bars!     -->
+    <xs:attribute      name="made"              type="steelmadetype" default="rolled" />
+    <xs:attribute      name="guid"              type="guidtype"      use="optional" />  <!-- But required from FD20.00.003!       -->
+    <xs:attribute      name="stage"             type="stage_number"  default="1" />     <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"         type="stage_data"    default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="pile_type">
+    <xs:sequence>
+      <xs:element name="beam"                        type="piles_beam_type" />
+      <xs:element name="point_support"                                  minOccurs="0" maxOccurs="1" >
+        <xs:complexType>
+          <xs:sequence>
+            <xs:choice>
+              <xs:element name="rigidity"         type="pile_rigidity_group_type1" />
+              <xs:element name="rigidity_group"   type="pile_rigidity_group_type2" />
+            </xs:choice>
+          </xs:sequence>
+          <xs:attribute   name="stage"     type="stage_number"          default="1" />          <!-- From FD21.00.003 -->
+          <xs:attribute   name="end_stage" type="stage_data"            default="last_stage" /> <!-- From FD22 -->
+          <xs:attribute   name="guid"      type="guidtype"              use="optional" />       <!-- From FD22, and mandatory from FD22 -->
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="line_support"                                   minOccurs="0" maxOccurs="unbounded" >
+        <xs:complexType>
+          <xs:choice>
+            <xs:element name="rigidity"         type="rigidity_data_type0" />
+            <xs:element name="rigidity_group"   type="pile_rigidity_group_type" />
+          </xs:choice>
+          <xs:attribute name="alpha_neg"        type="positive_double"  use="required" />
+          <xs:attribute name="beta_neg"         type="positive_double"  use="required" />
+          <xs:attribute name="stage"            type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+          <xs:attribute name="end_stage"        type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+          <xs:attribute name="guid"             type="guidtype"         use="optional" />       <!-- From FD22, and mandatory from FD22 -->
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="colouring"              type="entity_color" minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="type"                   type="piletype_type"    use="required" />
+    <xs:attribute name="division_length"        type="dot1_to_100_type" use="required" />
+    <xs:attribute name="surface_surcharge"      type="non_neg_max_1000" use="required" />
+    <xs:attribute name="neutral_level"          type="non_neg_max_1000" use="required" />
+    <xs:attribute name="auto_calculate"         type="xs:boolean"       default="true" />
+    <xs:attribute name="perimeter_by_contour"   type="xs:boolean"       default="true" />
+    <xs:attribute name="stage"                  type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute name="end_stage"              type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="excavation_type">
+    <xs:sequence>
+      <xs:element name="contour"                type="horizontal_polygon_2d" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="depth"                  type="positive_max_1000" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="retaining_wall_type">
+    <xs:sequence>
+      <xs:element name="internal_entity"        type="guid_list_type"   minOccurs="1" maxOccurs="3" /> <!-- 3 pcs. if soil_as_solid, otherwise 1 pc. -->
+      <xs:element name="slab_part"              type="slab_part_type" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="name"                  type="identifier"       use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="bh_strata_level_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1e6"/>
+      <xs:maxInclusive value="+10000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="bh_water_level_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-100000"/>
+      <xs:maxInclusive value="+10000"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="bh_strata_level_list">
+    <xs:list itemType="bh_strata_level_type"/>
+  </xs:simpleType>
+
+  <xs:simpleType name="bh_water_level_list">
+    <xs:list itemType="bh_water_level_type"/>
+  </xs:simpleType>
+
+  <xs:complexType name="all_levels_type">
+    <xs:sequence>
+      <xs:element name="strata_top_levels"    type="bh_strata_level_list" />
+      <xs:element name="water_levels"         type="bh_water_level_list"  />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="borehole_type">
+    <xs:sequence>
+      <xs:element name="whole_level_data"         type="all_levels_type"      minOccurs="0" maxOccurs="1" />
+      <xs:element name="colouring"                type="entity_color"         minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref= "entity_attribs" />
+    <xs:attribute      name="name"                type="identifier"           use="optional" />
+    <xs:attributeGroup ref= "coord2d"/>
+    <xs:attribute      name="final_ground_level"  type="bh_strata_level_type" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ===  End of SOIL types      ==================================== -->
+
+
+  <!--section types-->
+  <xs:simpleType name="sflags_type">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="7"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="section_type">
+    <xs:sequence>
+      <xs:element name="region_group" type="region_group_type" />
+      <xs:element name="end"          type="empty_type" />
+      <!--additional elements could be added by WIN-Statik, FEM-Design or RevIt-->
+      <xs:any minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"         type="xs:string"    use="required" />
+    <xs:attribute      name="type"         type="sectiontype"  use="required" />
+    <xs:attribute      name="fd-mat"       type="fd_mat_type"  default="-1" />
+    <xs:attribute      name="fd_name_code" type="xs:string"    use="optional" />
+    <xs:attribute      name="fd_name_type" type="xs:string"    use="optional" />
+    <xs:attribute      name="fd_name_size" type="xs:string"    use="optional" />
+    <xs:attribute      name="flags"        type="sflags_type"  default="1"    /> <!-- From FD22, only used for non-FD library cross sections -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--complex section type-->
+  <xs:complexType name="complex_section_type">
+    <xs:sequence>
+      <!--Minimum 1 section is necessary-->
+      <xs:element name="section" minOccurs="1" maxOccurs="unbounded">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="ecc"          type="point_type_3d" minOccurs="0" maxOccurs="1" />          <!-- If bar_part has analytical ecc, must be equal with it, & it used only for intermediate sections -->
+            <xs:element name="ecc_phys"     type="point_type_3d" minOccurs="0" maxOccurs="1" />          <!-- From FD18; physical eccentricity only for intermediate sections -->
+            <xs:element name="end"          type="empty_type" />
+            <!--additional elements could be added by WIN-Statik, FEM-Design or RevIt-->
+            <xs:any minOccurs="0" maxOccurs="unbounded" />
+          </xs:sequence>
+          <xs:attribute name="guid" type="guidtype" />
+          <xs:attribute name="pos"  type="position_type" use="required" />
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name" type="xs:string" use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:attributeGroup name="material_type_attribs">
+    <xs:attribute name="mass"   type="non_neg_max_1e20" use="required" />
+    <xs:attribute name="E_0"    type="xs:double"        use="required" />
+    <xs:attribute name="E_1"    type="xs:double"        use="required" />
+    <xs:attribute name="E_2"    type="xs:double"        use="required" />
+    <xs:attribute name="nu_0"   type="xs:double"        use="required" />
+    <xs:attribute name="nu_1"   type="xs:double"        use="required" />
+    <xs:attribute name="nu_2"   type="xs:double"        use="required" />
+    <xs:attribute name="alfa_0" type="xs:double"        use="required" />
+    <xs:attribute name="alfa_1" type="xs:double"        use="required" />
+    <xs:attribute name="alfa_2" type="xs:double"        use="required" />
+    <xs:attribute name="G_0"    type="xs:double"        use="required" />
+    <xs:attribute name="G_1"    type="xs:double"        use="required" />
+    <xs:attribute name="G_2"    type="xs:double"        use="required" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="optional_material_attribs">
+    <xs:attributeGroup ref="material_type_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="strength_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="brick_only"/>
+      <xs:enumeration value="masonry"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType       name="tda_creep_prony">
+    <xs:sequence>
+      <xs:element name="record" minOccurs="1" maxOccurs="unbounded">
+      	<xs:complexType>
+          <xs:attribute name="j"   type="abs_max_1e8"   use="required" />
+          <xs:attribute name="tau" type="abs_max_1e8"   use="required" />
+      	</xs:complexType>
+      </xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="Ac_u_type">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="0"/>
+      <xs:maxInclusive value="1.798E38"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="tda_creep_EN1992">
+    <xs:attribute name="t0"             type="positive_max_1e8"  use="required" />
+    <xs:attribute name="RH"             type="positive_max_100"  use="required" />
+    <xs:attribute name="calculate_Ac_u" type="xs:boolean"        use="required" />
+    <xs:attribute name="Ac"             type="Ac_u_type"         use="required" />
+    <xs:attribute name="u"              type="Ac_u_type"         use="required" />
+    <xs:attribute name="sigma_relevant" type="xs:boolean"        use="required" />
+    <xs:attribute name="cement_type"    type="cement_type"       use="required" />
+    <xs:attribute name="increase_final_value" type="xs:boolean"  use="required" />
+  </xs:complexType>
+
+  <xs:complexType name="tda_creep_compliance_general">
+    <xs:sequence>
+      <xs:element name="record" minOccurs="1" maxOccurs="unbounded">
+      	<xs:complexType>
+          <xs:attribute name="t"        type="non_neg_max_1e7"  use="required" />
+          <xs:attribute name="j"        type="from_1_to_1e5"    use="required" />
+      	</xs:complexType>
+      </xs:element>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="tda_creep1">
+    <xs:sequence>
+<xs:choice>
+      <xs:element name="creep_compliance_prony_series"  type="tda_creep_prony"  />
+   <xs:element name="creep_compliance_by_data_set"      type="tda_creep_compliance_general"  />
+</xs:choice>
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="tda_creep2">
+    <xs:choice>
+      <xs:element name="creep_compliance_prony_series"  type="tda_creep_prony"  />
+      <xs:element name="EN_1992-1-1_2004"               type="tda_creep_EN1992"  />
+      <xs:element name="creep_compliance_by_data_set"   type="tda_creep_compliance_general"  />
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:simpleType name="cement_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value=""/>
+      <xs:enumeration value="Class N"/>
+      <xs:enumeration value="Class R"/>
+      <xs:enumeration value="Class S"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="tda_shrinkage">
+    <xs:choice>
+      <xs:element name="General">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="record" minOccurs="0" maxOccurs="unbounded" >
+              <xs:complexType>
+                <xs:attribute name="t"       type="non_neg_max_1e8"   use="required" />
+                <xs:attribute name="strain"  type="non_neg_max_1e8"   use="required" />
+              </xs:complexType>
+            </xs:element>
+          </xs:sequence>
+      	</xs:complexType>
+      </xs:element>
+      <xs:element name="EN_1992-1-1_2004">
+        <xs:complexType>
+          <xs:attribute name="ts"             type="positive_max_1e8" use="required" />
+          <xs:attribute name="RH"             type="positive_max_100" use="required" />
+          <xs:attribute name="calculate_Ac_u" type="xs:boolean"       use="required" />
+          <xs:attribute name="Ac"             type="Ac_u_type"        use="required" />
+          <xs:attribute name="u"              type="Ac_u_type"        use="required" />
+          <xs:attribute name="cement_type"    type="cement_type"      use="required" />
+        </xs:complexType>
+      </xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:complexType name="tda_elasticity">
+    <xs:choice>
+      <xs:element name="General">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="record" minOccurs="1" maxOccurs="unbounded" >
+              <xs:complexType>
+                <xs:attribute name="t"     type="non_neg_max_1e8"  use="required" />
+                <xs:attribute name="E"     type="positive_max_1e8" use="required" />
+              </xs:complexType>
+            </xs:element>
+          </xs:sequence>
+      	</xs:complexType>
+      </xs:element>
+      <xs:element name="EN_1992-1-1_2004">
+        <xs:complexType>
+          <xs:attribute name="cement_type" type="cement_type"      use="required" />
+          <xs:attribute name="t0"          type="positive_max_1e8" use="required" />
+        </xs:complexType>
+      </xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <xs:simpleType name="cc_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="Crisfield"/>
+      <xs:enumeration value="Cervera"/>
+      <xs:enumeration value="Hinton"/>
+      <xs:enumeration value="Prager"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ts_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="Hinton"/>
+      <xs:enumeration value="Vecchio"/>
+      <xs:enumeration value="Linear"/>
+      <xs:enumeration value="Cervera"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="rcs_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="+1.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="rcsm_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="Vecchio 1" />
+      <xs:enumeration value="Vecchio 2" />
+      <xs:enumeration value="Cervera" />
+      <xs:enumeration value="Model Code 2010" />
+    </xs:restriction>
+  </xs:simpleType>
+
+
+  <xs:complexType name="concrete_pl_attribs">
+    <xs:attribute name="elasto_plastic_behaviour"            type="xs:boolean"   use="required" />
+    <xs:attribute name="plastic_hardening"                   type="xs:boolean"   use="required" />
+    <xs:attribute name="concrete_crushing"                   type="xs:boolean"   use="required" />
+    <xs:attribute name="concrete_crushing_option"            type="cc_type"      use="required" />
+    <xs:attribute name="tension_strength"                    type="xs:boolean"   use="required" />
+    <xs:attribute name="tension_stiffening"                  type="xs:boolean"   use="required" />
+    <xs:attribute name="tension_stiffening_option"           type="ts_type"      use="required" />
+    <xs:attribute name="tension_stiffening_param"            type="xs:double"    use="required"  />
+    <xs:attribute name="reduced_compression_strength"        type="xs:boolean"   use="required" />
+    <xs:attribute name="reduced_compression_strength_option" type="rcsm_type"    use="required" />
+    <xs:attribute name="reduced_compression_strength_param"  type="rcs_type"     use="required" />
+    <xs:attribute name="reduced_transverse_shear_stiffnes"   type="xs:boolean"   use="required" />
+    <xs:attribute name="ultimate_strain"                     type="xs:boolean"   use="required" />
+  </xs:complexType>
+
+  <xs:complexType name="concrete_pl_data">
+    <xs:sequence>
+      <xs:element name="U"  type="concrete_pl_attribs" />
+      <xs:element name="Sq" type="concrete_pl_attribs" />
+      <xs:element name="Sf" type="concrete_pl_attribs" />
+      <xs:element name="Sc" type="concrete_pl_attribs" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <xs:simpleType name="spl_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="50"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="steel_pl_data">
+    <xs:attribute name="elasto_plastic_behaviour_U"            type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_U"         type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_option_U"  type="spl_type"   use="required" />
+    <xs:attribute name="elasto_plastic_behaviour_Sq"           type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_Sq"        type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_option_Sq" type="spl_type"   use="required" />
+    <xs:attribute name="elasto_plastic_behaviour_Sf"           type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_Sf"        type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_option_Sf" type="spl_type"   use="required" />
+    <xs:attribute name="elasto_plastic_behaviour_Sc"           type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_Sc"        type="xs:boolean" use="required" />
+    <xs:attribute name="elasto_plastic_strain_limit_option_Sc" type="spl_type"   use="required" />
+  </xs:complexType>
+
+  <!--material type-->
+  <xs:complexType name="material_type">
+    <xs:choice>
+      <!--one of the following elements is required-->
+      <xs:element name="concrete">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="tda_creep"      type="tda_creep2"         minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+            <xs:element name="tda_shrinkage"  type="tda_shrinkage"      minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+            <xs:element name="tda_elasticity" type="tda_elasticity"     minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+            <xs:element name="plastic_analysis_data" type="concrete_pl_data"      minOccurs="0" maxOccurs="1" /> <!-- From FD23 and mandatory from FD23! -->
+          </xs:sequence>
+          <xs:attributeGroup ref="material_type_attribs" />
+          <xs:attribute name="Fck"         type="material_base_value"   use="required" />
+          <xs:attribute name="Fck_cube"    type="material_base_value"   default="30.0" /> <!-- From FD17 -->
+          <xs:attribute name="Fctk"        type="material_base_value"   use="required" />
+          <xs:attribute name="Fctm"        type="material_base_value"   use="required" />
+          <xs:attribute name="Ecm"         type="material_base_value"   use="required" />
+          <xs:attribute name="gammaC_0"    type="material_base_value"   use="required" />
+          <xs:attribute name="gammaC_1"    type="material_base_value"   use="required" />
+          <xs:attribute name="gammaCE"     type="material_base_value"   use="required" />
+          <xs:attribute name="gammaCfi"    type="material_base_value"   default="1.0"  /> <!-- From FD20 -->
+          <xs:attribute name="gammaS_0"    type="material_base_value"   use="required" />
+          <xs:attribute name="gammaS_1"    type="material_base_value"   use="required" />
+          <xs:attribute name="gammaSfi"    type="material_base_value"   default="1.0"  /> <!-- From FD20 -->
+          <xs:attribute name="alfaCc"      type="material_base_value"   use="required" />
+          <xs:attribute name="alfaCt"      type="material_base_value"   use="required" />
+          <xs:attribute name="Fcd_0"       type="xs:double"             use="required" />
+          <xs:attribute name="Fcd_1"       type="xs:double"             use="required" />
+          <xs:attribute name="Fctd_0"      type="xs:double"             use="required" />
+          <xs:attribute name="Fctd_1"      type="xs:double"             use="required" />
+          <xs:attribute name="Ecd_0"       type="xs:double"             use="required" />
+          <xs:attribute name="Ecd_1"       type="xs:double"             use="required" />
+          <xs:attribute name="Epsc2"       type="material_base_value"   use="optional" /> <!-- From FD19, and REQUIRED from FD19! -->
+          <xs:attribute name="Epscu2"      type="material_base_value"   use="optional" /> <!-- From FD19, and REQUIRED from FD19! -->
+          <xs:attribute name="Epsc3"       type="material_base_value"   use="required" />
+          <xs:attribute name="Epscu3"      type="material_base_value"   use="required" />
+          <xs:attribute name="environment" type="xs:integer"            use="required" />
+          <xs:attribute name="creep"       type="material_0base_value"  use="required" /> <!-- Before FD14: creep, from FD14: creep ULS -->
+          <xs:attribute name="creep_sls"   type="material_0base_value"  default="0.0"  /> <!-- General Creep Sls From FD14, from FD19: creep Slq -->
+          <xs:attribute name="creep_slf"   type="material_0base_value"  default="0.0"  /> <!-- From FD19 -->
+          <xs:attribute name="creep_slc"   type="material_0base_value"  default="0.0"  /> <!-- From FD19 -->
+          <xs:attribute name="shrinkage"   type="non_neg_max_1000"      use="required" />
+          <xs:attribute name="nu"          type="material_nu_value"     use="required" />
+          <xs:attribute name="alfa"        type="material_base_value"   use="required" />
+          <xs:attribute name="reduction"   type="positive_max_10"       default="1.0"  /> <!-- From FD13, positive_max_10 limit from FD18.00.003 -->
+          <xs:attribute name="stability"   type="reduction_factor_type" default="1.0"  /> <!-- From FD14 -->
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="steel">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="tda_creep"     type="tda_creep1" minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+            <xs:element name="plastic_analysis_data"  type="steel_pl_data"   minOccurs="0" maxOccurs="1" /> <!-- From FD23 and mandatory from FD23! -->
+          </xs:sequence>
+          <xs:attributeGroup ref="material_type_attribs" />
+          <xs:attribute name="Fyk16"     type="material_base_value" use="required" />
+          <xs:attribute name="Fyk40"     type="material_base_value" use="required" />
+          <xs:attribute name="Fyk63"     type="material_base_value" use="required" />
+          <xs:attribute name="Fyk80"     type="material_base_value" use="required" />
+          <xs:attribute name="Fyk100"    type="material_base_value" use="required" />
+          <xs:attribute name="Fyk150"    type="material_base_value" use="required" />
+          <xs:attribute name="Fyk200"    type="material_base_value" use="required" />
+          <xs:attribute name="Fyk250"    type="material_base_value" use="required" />
+          <xs:attribute name="Fyk400"    type="material_base_value" use="required" />
+          <xs:attribute name="Fuk3"      type="material_base_value" use="required" />
+          <xs:attribute name="Fuk40"     type="material_base_value" use="required" />
+          <xs:attribute name="Fuk100"    type="material_base_value" use="required" />
+          <xs:attribute name="Fuk150"    type="material_base_value" use="required" />
+          <xs:attribute name="Fuk250"    type="material_base_value" use="required" />
+          <xs:attribute name="Fuk400"    type="material_base_value" use="required" />
+          <xs:attribute name="gammaM0_0" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM0_1" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM1_0" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM1_1" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM2_0" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM2_1" type="material_base_value" use="required" />
+          <xs:attribute name="gammaM5_0" type="material_base_value" use="optional" />   <!-- From FD15.00.005. The default input value according to the material's national annex -->
+          <xs:attribute name="gammaM5_1" type="material_base_value" use="optional" />   <!-- From FD15.00.005. The default input value according to the material's national annex -->
+          <xs:attribute name="gammaMfi"  type="material_base_value" default="1.0"  />   <!-- From FD17 -->
+          <xs:attribute name="Ek"        type="material_base_value" use="required" />
+          <xs:attribute name="Ed_0"      type="xs:double"           use="required" />
+          <xs:attribute name="Ed_1"      type="xs:double"           use="required" />
+          <xs:attribute name="nu"        type="material_nu_value"   use="required" />
+          <xs:attribute name="G"         type="material_base_value" use="required" />
+          <xs:attribute name="alfa"      type="material_base_value" use="required" />
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="timber">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="tda_creep"    type="tda_creep1" minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+          </xs:sequence>
+          <xs:attributeGroup ref="material_type_attribs" />
+          <xs:attribute name="type"     type="xs:integer"            use="required" />
+          <xs:attribute name="quality"  type="xs:integer"            use="required" />
+          <xs:attribute name="Fmk0"     type="material_base_value"   use="required" />
+          <xs:attribute name="Fmk90"    type="material_base_value"   use="required" />
+          <xs:attribute name="Ft0k"     type="material_base_value"   use="required" />
+          <xs:attribute name="Ft90k"    type="material_base_value"   use="required" />
+          <xs:attribute name="Fc0k"     type="material_base_value"   use="required" />
+          <xs:attribute name="Fc90k"    type="material_base_value"   use="required" />
+          <xs:attribute name="Fvk"      type="material_base_value"   use="required" />
+          <xs:attribute name="E0mean"   type="material_base_value"   use="required" />
+          <xs:attribute name="E90mean"  type="material_base_value"   use="required" />
+          <xs:attribute name="E005"     type="material_base_value"   use="required" />
+          <xs:attribute name="Gmean"    type="material_base_value"   use="required" />
+          <xs:attribute name="G005"     type="material_base_value"   use="required" />
+          <xs:attribute name="Rhok"     type="material_base_value"   use="required" />
+          <xs:attribute name="Rhomean"  type="material_base_value"   use="required" />
+          <xs:attribute name="E0comp"   type="xs:double"             use="required" />
+          <xs:attribute name="E90comp"  type="xs:double"             use="required" />
+          <xs:attribute name="gammaM_0" type="material_base_value"   use="required" />
+          <xs:attribute name="gammaM_1" type="material_base_value"   use="required" />
+          <xs:attribute name="ksys"     type="xs:double"             use="required" />
+          <xs:attribute name="k_cr"     type="reduction_factor_type" use="optional" />  <!-- From FD15. The default input value according to the material's national annex -->
+          <xs:attribute name="service_class" type="timber_service_class" use="required" />
+          <xs:attribute name="kdefU"    type="material_0base_value"  use="optional" />  <!-- but mandatory from FD19. The default input value is according to FD18's kdef default -->
+          <xs:attribute name="kdefSq"   type="material_0base_value"  use="optional" />  <!-- From FD19. The default input value according to the prior data -->
+          <xs:attribute name="kdefSf"   type="material_0base_value"  use="optional" />  <!-- From FD19. The default input value according to the prior data -->
+          <xs:attribute name="kdefSc"   type="material_0base_value"  use="optional" />  <!-- From FD19. The default input value according to the prior data -->
+          <xs:attribute name="gammaMfi" type="material_base_value"   use="optional" />  <!-- From FD19. The default input value according to the prior data -->
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="brick"> <!-- From FD20 -->
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="base_data" type="optional_material_attribs" minOccurs="0" maxOccurs="1" /> <!-- From FD22 and mandatory from FD22 -->
+          </xs:sequence>
+          <xs:attribute name="strength_for"                 type="strength_type"        default="brick_only" />  <!-- "masonry" only for FD20's brick materials -->
+          <xs:attribute name="fb"                           type="material_base_value"  use="required" />
+          <xs:attribute name="nu"                           type="material_nu_value"    use="required" />
+          <xs:attribute name="rho"                          type="material_base_value"  use="required" />
+          <xs:attribute name="alpha_thermal"                type="material_base_value"  use="required" />
+          <xs:attribute name="gammaM_0"                     type="material_base_value"  use="required" />
+          <xs:attribute name="gammaM_1"                     type="material_base_value"  use="required" />
+          <xs:attribute name="fm"                           type="material_base_value"  use="required" />
+          <xs:attribute name="K"                            type="material_base_value"  use="required" />
+          <xs:attribute name="alpha"                        type="material_0base_value" use="required" />
+          <xs:attribute name="beta"                         type="material_0base_value" use="required" />
+          <xs:attribute name="elasticity_modulus"           type="material_base_value"  use="required" />
+          <xs:attribute name="elasticity_calculated_by_KE"  type="xs:boolean"           default="false" />
+          <xs:attribute name="creep_U"                      type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sq"                     type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sf"                     type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sc"                     type="material_0base_value" use="required" />
+          <xs:attribute name="phi"                          type="material_base_value"  use="required" />
+          <xs:attribute name="filled_vertical_joints"       type="xs:boolean"           use="optional" /> <!-- From FD21 -->
+          <xs:attribute name="km"                           type="material_base_value"  use="optional" /> <!-- From FD21 -->
+          <xs:attribute name="muk"                          type="material_base_value"  use="optional" /> <!-- From FD21 -->
+          <xs:attribute name="ct"                           type="material_base_value"  use="optional" /> <!-- From FD21 -->
+          <xs:attribute name="fvk0"                         type="material_base_value"  use="optional" /> <!-- From FD21 -->
+          <xs:attribute name="fvlt"                         type="material_base_value"  use="optional" /> <!-- From FD21 -->
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="masonry"> <!-- From FD21 -->
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="base_data" type="optional_material_attribs" minOccurs="0" maxOccurs="1" /> <!-- From FD22 and mandatory from FD22 -->
+          </xs:sequence>
+          <xs:attribute name="fk"                           type="material_base_value"  use="required" />
+          <xs:attribute name="nu"                           type="material_nu_value"    use="required" />
+          <xs:attribute name="rho"                          type="material_base_value"  use="required" />
+          <xs:attribute name="alpha_thermal"                type="material_base_value"  use="required" />
+          <xs:attribute name="gammaM_0"                     type="material_base_value"  use="required" />
+          <xs:attribute name="gammaM_1"                     type="material_base_value"  use="required" />
+          <xs:attribute name="fm"                           type="material_base_value"  use="required" />
+          <xs:attribute name="K"                            type="material_base_value"  use="required" />
+          <xs:attribute name="alpha"                        type="material_0base_value" use="required" />
+          <xs:attribute name="beta"                         type="material_0base_value" use="required" />
+          <xs:attribute name="elasticity_modulus"           type="material_base_value"  use="required" />
+          <xs:attribute name="elasticity_calculated_by_KE"  type="xs:boolean"           default="false" />
+          <xs:attribute name="creep_U"                      type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sq"                     type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sf"                     type="material_0base_value" use="required" />
+          <xs:attribute name="creep_Sc"                     type="material_0base_value" use="required" />
+          <xs:attribute name="phi"                          type="material_base_value"  use="required" />
+          <xs:attribute name="filled_vertical_joints"       type="xs:boolean"           use="optional" />
+          <xs:attribute name="km"                           type="material_base_value"  use="optional" />
+          <xs:attribute name="muk"                          type="material_base_value"  use="optional" />
+          <xs:attribute name="ct"                           type="material_base_value"  use="optional" />
+          <xs:attribute name="fvk0"                         type="material_base_value"  use="optional" />
+          <xs:attribute name="fvlt"                         type="material_base_value"  use="optional" />
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="stratum"> <!-- From FD20 -->
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="base_data" type="optional_material_attribs" minOccurs="0" maxOccurs="1" /> <!-- From FD22 and mandatory from FD22 -->
+            <xs:element name="behaviour">
+              <xs:complexType>
+                <xs:choice>
+                  <xs:element name="drained">
+                    <xs:complexType>
+                      <xs:attribute name="c_k"        type="material_0base_value"  use="required" />
+                      <xs:attribute name="c_k_depth"  type="material_0base_value"  use="required" />
+                      <xs:attribute name="phi_k"      type="max_89dot9degree"      use="required" />
+                      <xs:attribute name="phi_cvk"    type="max_89dot9degree"      use="required" />
+                    </xs:complexType>
+                  </xs:element>
+                  <xs:element name="undrained">
+                    <xs:complexType>
+                      <xs:attribute name="c_uk"       type="material_base_value"   use="required" />
+                      <xs:attribute name="c_uk_depth" type="material_0base_value"  use="required" />
+                    </xs:complexType>
+                  </xs:element>
+                  <xs:element name="combined">
+                    <xs:complexType>
+                      <xs:attribute name="drained"    type="xs:boolean"            default="false"/>
+                      <xs:attribute name="c_uk"       type="material_base_value"   use="required" />
+                      <xs:attribute name="c_uk_depth" type="material_0base_value"  use="required" />
+                      <xs:attribute name="c_k"        type="material_0base_value"  use="required" />
+                      <xs:attribute name="c_k_depth"  type="material_0base_value"  use="required" />
+                      <xs:attribute name="phi_k"      type="max_89dot9degree"      use="required" />
+                      <xs:attribute name="phi_cvk"    type="max_89dot9degree"      use="required" />
+                    </xs:complexType>
+                  </xs:element>
+                </xs:choice>
+              </xs:complexType>
+            </xs:element>
+            <xs:element name="model">
+               <xs:complexType>
+                 <xs:choice>
+                   <xs:element name="generic">
+                     <xs:complexType>
+                       <xs:sequence>
+                         <xs:element name="record"         minOccurs="1" maxOccurs="5" >
+                           <xs:complexType>
+                             <xs:attribute name="Sigma"  type="positive_max_1e5"  use="required" />
+                             <xs:attribute name="p"      type="non_neg_max_1e5"   use="required" />
+                             <xs:attribute name="pd"     type="non_neg_max_1e5"   use="required" />
+                             <xs:attribute name="M"      type="positive_max_1e5"  use="required" />
+                             <xs:attribute name="Md"     type="non_neg_max_1e5"   use="required" />
+                           </xs:complexType>
+                         </xs:element>
+                       </xs:sequence>
+                       <xs:attribute name="Mu"         type="material_base_value"   use="required" />
+                       <xs:attribute name="Mu_depth"   type="material_0base_value"  use="required" />
+                     </xs:complexType>
+                   </xs:element>
+                   <xs:element name="linear">
+                     <xs:complexType>
+                       <xs:attribute name="use_E"      type="xs:boolean"            default="false" />
+                       <xs:attribute name="value"      type="material_base_value"   use="required" />
+                       <xs:attribute name="M0_depth"   type="material_0base_value"  use="required" />
+                     </xs:complexType>
+                   </xs:element>
+                   <xs:element name="overconsolidated">
+                     <xs:complexType>
+                       <xs:attribute name="Mu"         type="material_base_value"   use="required" />
+                       <xs:attribute name="Mu_depth"   type="material_0base_value"  use="required" />
+                       <xs:attribute name="M0"         type="material_base_value"   use="required" />
+                       <xs:attribute name="M0_depth"   type="material_0base_value"  use="required" />
+                       <xs:attribute name="ML"         type="material_base_value"   use="required" />
+                       <xs:attribute name="ML_depth"   type="material_0base_value"  use="required" />
+                       <xs:attribute name="M"          type="material_0base_value"  use="required" />
+                       <xs:attribute name="M_depth"    type="material_0base_value"  use="required" />
+                       <xs:attribute name="Sigma_c"    type="material_base_value"   use="required" />
+                       <xs:attribute name="p_c"        type="material_0base_value"  use="required" />
+                       <xs:attribute name="pc_depth"   type="material_0base_value"  use="required" />
+                       <xs:attribute name="Sigma_L"    type="material_base_value"   use="required" />
+                       <xs:attribute name="p_L"        type="material_0base_value"  use="required" />
+                       <xs:attribute name="p_L_depth"  type="material_0base_value"  use="required" />
+                     </xs:complexType>
+                   </xs:element>
+                  </xs:choice>
+               </xs:complexType>
+            </xs:element>
+          </xs:sequence>
+          <xs:attribute name="reference_level" type="xs:double"             use="required" />
+          <xs:attribute name="Gamma_dry"       type="material_base_value"   use="required" />
+          <xs:attribute name="Gamma_sat"       type="material_base_value"   use="required" />
+          <xs:attribute name="nu"              type="material_nu_value"     use="required" />
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    <!-- next choice -->
+      <xs:element name="custom">
+        <xs:complexType>
+          <xs:attributeGroup ref="material_type_attribs" />
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <xs:element name="reference" type="reference_type" />
+    </xs:choice>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"      type="name256"      use="required" />
+    <xs:attribute      name="standard"  type="standardtype" use="required" />
+    <xs:attribute      name="country"   type="eurocodetype" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--complex material type-->
+  <xs:complexType      name="complex_material_type">         <!-- NOT IMPLEMENTED YET, all complex_materials refering 'single' material_type materials now! -->
+    <xs:sequence>
+      <xs:element name="material" type="reference_type" minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name" type="xs:string" use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ==========  Reinforcement types  ======================================= -->
+
+  <xs:simpleType name="studrail_patterns">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="radial"/>
+      <xs:enumeration value="orthogonal"/>
+      <xs:enumeration value="semi-orthogonal"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="studrail_s0_range">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.02"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="studrail_s12_range">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.03"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="studrail_rail_range">
+    <xs:restriction base="xs:integer">
+      <xs:minInclusive value="4"/>
+      <xs:maxInclusive value="50"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="studrail_stud_range">
+    <xs:restriction base="xs:integer">
+      <xs:minInclusive value="2"/>
+      <xs:maxInclusive value="50"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="studrail_height"> <!-- values in millimeter -->
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.01"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="rc_diameter_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="0.1"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="rc_k_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="1.0"/>  <!-- From FD18: It is 1.0 for compatibility reasons, but if the imported value less than 1.05, then FD calculating with 1.05 -->
+      <xs:maxInclusive value="1E10"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--reinforcing material type -->
+  <xs:complexType name="rfmaterial_type">
+    <xs:sequence>
+      <xs:element name="reinforcing_steel">
+        <xs:complexType>
+          <xs:attribute name="fyk"        type="non_neg_max_1e10"  use="required" />
+          <xs:attribute name="Es"         type="non_neg_max_1e10"  use="required" />
+          <xs:attribute name="Epsilon_uk" type="non_neg_max_1e10"  use="required" />
+          <xs:attribute name="Epsilon_ud" type="non_neg_max_1e10"  use="required" />
+          <xs:attribute name="k"          type="rc_k_value"        use="required" />
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"     type="string15"     use="required" />
+    <xs:attribute      name="standard" type="standardtype" use="required" />
+    <xs:attribute      name="country"  type="eurocodetype" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="wire_profile_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="smooth"/>
+      <xs:enumeration value="ribbed"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--reinforcing wire type-->
+  <xs:complexType name="rf_wire_type">
+    <xs:attribute name="diameter"             type="rc_diameter_value" use="required" />
+    <xs:attribute name="reinforcing_material" type="guidtype"          use="required" />
+    <xs:attribute name="profile"              type="wire_profile_type" default="ribbed" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--reinforcement parameter type -->
+  <xs:complexType name="shell_rf_params_type">
+    <xs:sequence>
+      <xs:element name="base_shell" type="guid_list_type" />
+      <xs:element name="center" >
+          <xs:complexType>
+              <xs:attributeGroup ref="coord3d" />
+              <xs:attribute name="polar_system" type="xs:boolean" use="required" />
+              <xs:anyAttribute   processContents="skip"/>
+          </xs:complexType>
+      </xs:element>
+      <xs:element name="x_direction"  type="point_type_3d" />
+      <xs:element name="y_direction"  type="point_type_3d" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="single_layer_reinforcement" type="xs:boolean" default="false" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--bar reinforcement type -->
+  <xs:complexType name="bar_rf_type" >
+     <xs:sequence>
+        <xs:element name="base_bar" type="guid_list_type" />
+        <xs:element name="wire" type="rf_wire_type" />
+        <xs:choice>
+           <xs:element name="stirrups" >
+              <xs:complexType>
+                 <xs:sequence>
+                    <xs:element name="region" type="region_type" />
+                 </xs:sequence>
+                 <xs:attributeGroup ref="unchecked_start_end_attribs" />
+                 <xs:attribute      name="distance" type="positive_double" use="required" />
+                 <xs:anyAttribute   processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        <!-- next choice -->
+           <xs:element name="longitudinal_bar" >
+              <xs:complexType>
+                 <xs:sequence>
+                    <xs:element name="cross-sectional_position" type="point_type_2d" />
+                    <xs:element name="anchorage"                type="start_end_type" />
+                    <xs:element name="prescribed_lengthening"   type="start_end_type" minOccurs="0" maxOccurs="1" /> <!-- from FD 19.00.002 -->
+                 </xs:sequence>
+                 <xs:attribute     name="start"     type="xs:double"       use="required" />
+                 <xs:attribute     name="end"       type="positive_double" use="required" />
+                 <xs:attribute     name="auxiliary" type="xs:boolean"      use="required" />
+                 <xs:anyAttribute  processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        </xs:choice>
+     </xs:sequence>
+     <xs:attributeGroup ref="entity_attribs" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="mrm_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="EN1992-1-1 5.3.2.2(3)"/>
+      <xs:enumeration value="EN1992-1-1 5.3.2.2(4)"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="t_data_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0"/>
+      <xs:maxInclusive value="1"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- beam reduction zone types -->
+
+  <xs:complexType name="beam_ed_type" >
+     <xs:attribute  name="t_left"                      type="t_data_type"  use="required" />
+     <xs:attribute  name="t_right"                     type="t_data_type"  use="required" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="beam_reduction_zone_type" >
+     <xs:sequence>
+        <xs:element name="position"                    type="point_type_3d"/>
+        <xs:element name="extent_definition"           type="beam_ed_type" minOccurs="0" maxOccurs="1" />
+     </xs:sequence>
+     <xs:attribute  name="base_beam"                   type="guidtype"     use="required" />
+     <xs:attribute  name="moment_reduction_method"     type="mrm_type"     use="required" />
+     <xs:attribute  name="automatic_extent_definition" type="xs:boolean"   default="false" />
+     <xs:attribute  name="moment_reduction"            type="xs:boolean"   default="true" />
+     <xs:attribute  name="sheart_reduction"            type="xs:boolean"   default="true" />
+     <xs:attribute  name="connected_to"                type="guidtype"     use="optional" />
+     <xs:attributeGroup ref="entity_attribs" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--punching area (column) type -->
+  <xs:complexType name="punching_area_type" >
+     <xs:sequence>
+        <xs:element name="base_shell"    type="guid_list_type" />
+        <xs:element name="connected_bar" type="guid_list_type" minOccurs="0" maxOccurs="2" />
+
+        <!-- local system & check point -->
+        <xs:element name="local_pos"   type="point_type_3d" />
+        <xs:element name="local_x"     type="point_type_3d" />
+        <xs:element name="local_y"     type="point_type_3d" />
+        <xs:element name="reference_points_offset" type="point_type_3d"  minOccurs="0" maxOccurs="1" /> <!-- From FD22.00.002: not used (From FD18, offset of reference point, default: null vector) -->
+
+        <xs:element name="region" type="region_type" />
+     </xs:sequence>
+     <xs:attributeGroup ref="entity_attribs" />
+     <xs:attribute      name="downward"      type="xs:boolean" default="false" />
+     <xs:attribute      name="manual_design" type="xs:boolean" default="false" />
+     <xs:attribute      name="name"          type="identifier" default="PU" />     <!-- Warning: only 'manual_designed' PU-s allowed used defined 'name' -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wbr_type" >
+     <xs:sequence>
+        <xs:element name="connected_wall"    type="guid_list_type" />
+        <xs:element name="pt"                type="point_type_3d" />
+        <xs:element name="dir"               type="point_type_3d" />
+        <xs:element name="stirrup_pt"        type="point_type_3d" />
+        <xs:element name="stirrup_dir"       type="point_type_3d" />
+     </xs:sequence>
+  </xs:complexType>
+
+  <!--punching area (wall) type -->
+  <xs:complexType name="punching_area_wall_type" >
+     <xs:sequence>
+        <xs:element name="base_shell"    type="guid_list_type" />
+
+        <!-- local system & check point -->
+        <xs:element name="local_pos"     type="point_type_3d" />
+        <xs:element name="local_x"       type="point_type_3d" />
+        <xs:element name="local_y"       type="point_type_3d" />
+        <xs:element name="reference_points_offset" type="point_type_3d"  minOccurs="0" maxOccurs="1" /> <!-- Offset of reference point, default: null vector -->
+
+        <!-- wall base rays -->
+        <xs:element name="wall_base_ray" type="wbr_type"  minOccurs="1" maxOccurs="2" />
+
+        <xs:element name="region" type="region_type" />
+     </xs:sequence>
+     <xs:attributeGroup ref="entity_attribs" />
+     <xs:attribute      name="downward"      type="xs:boolean" default="false" />
+     <xs:attribute      name="manual_design" type="xs:boolean" default="false" />
+     <xs:attribute      name="name"          type="identifier" default="PU" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- psh limits -->
+  <xs:simpleType name="psh_diameter_value">
+    <xs:restriction base="xs:double">
+      <xs:enumeration value="0.025"/>
+      <xs:enumeration value="0.032"/>
+      <xs:enumeration value="0.040"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="psh_cd_value">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.02"/>
+      <xs:maxInclusive value="10.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="psh_ndir_value">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="2"/>
+      <xs:maxInclusive value="50"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="psh_data" >
+     <xs:attribute name="diameter"   type="psh_diameter_value"   use="required" />
+     <xs:attribute name="cd"         type="psh_cd_value"         use="required" />
+     <xs:attribute name="n_x_dir"    type="psh_ndir_value"       use="required" />
+     <xs:attribute name="n_y_dir"    type="psh_ndir_value"       use="required" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--punching reinforcement type -->
+  <xs:complexType name="punching_reinforcement_type" >
+     <xs:sequence>
+        <xs:element name="base_shell"    type="guid_list_type" />
+        <xs:element name="punching_area" type="guid_list_type" />
+        <xs:choice>
+           <xs:element name = "bended_bar">
+              <xs:complexType>
+                 <xs:sequence>
+                    <xs:element name="local_center"          type="point_type_3d" />
+                    <xs:element name="wire"                  type="rf_wire_type" />
+                 </xs:sequence>
+                 <xs:attribute name="tip_sections_length"    type="positive_double"   use="required" />
+                 <xs:attribute name="middle_sections_length" type="positive_double"   use="required" />
+                 <xs:attribute name="height"                 type="positive_double"   use="required" />
+                 <xs:attribute name="angle"                  type="positive_quadrant" use="required" />
+                 <xs:attribute name="direction"              type="direction_type"    use="required" />
+                 <xs:anyAttribute   processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        <!-- next choice of types -->
+           <xs:element name = "open_stirrups">
+              <xs:complexType>
+                 <xs:sequence>
+                    <xs:element name="wire"      type="rf_wire_type" />
+                    <xs:element name="region"    type="region_type" />
+                 </xs:sequence>
+                 <xs:attribute name="width"      type="positive_double"   use="required" />
+                 <xs:attribute name="length"     type="positive_double"   use="required" />
+                 <xs:attribute name="height"     type="positive_double"   use="required" />
+                 <xs:attribute name="distance_x" type="positive_double"   use="required" />
+                 <xs:attribute name="distance_y" type="positive_double"   use="required" />
+                 <xs:anyAttribute   processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        <!-- next choice of types  -->
+           <xs:element name = "reinforcing_ring">
+              <xs:complexType>
+                 <xs:sequence>
+                    <xs:element name="auxiliary_reinforcement" >
+                      <xs:complexType>
+                         <xs:sequence>
+                            <xs:element name="wire"        type="rf_wire_type" />
+                         </xs:sequence>
+                         <xs:attribute name="inner_radius" type="non_negative_double"     use="required" />
+                         <xs:attribute name="overlap"      type="non_negative_double" use="required" />
+                         <xs:anyAttribute   processContents="skip"/>
+                      </xs:complexType>
+                    </xs:element>
+                    <xs:element name="stirrups" >
+                      <xs:complexType>
+                         <xs:sequence>
+                            <xs:element name="wire"        type="rf_wire_type" />
+                         </xs:sequence>
+                         <xs:attribute name="width"        type="positive_double"   use="required" />
+                         <xs:attribute name="height"       type="positive_double"   use="required" />
+                         <xs:attribute name="max_distance" type="positive_double"   use="required" />
+                         <xs:anyAttribute   processContents="skip"/>
+                      </xs:complexType>
+                    </xs:element>
+                 </xs:sequence>
+              </xs:complexType>
+           </xs:element>
+        <!-- next choice of types, from FD18 -->
+           <xs:element name = "stud_rails">
+              <xs:complexType>
+                 <xs:sequence>
+                    <!-- product types -->
+                    <xs:choice>
+                      <xs:element name = "general_product">
+                         <xs:complexType>
+                            <xs:sequence>
+                               <xs:element name="wire"         type="rf_wire_type" />
+                            </xs:sequence>
+                            <xs:anyAttribute   processContents="skip"/>
+                         </xs:complexType>
+                      </xs:element>
+                      <!-- other choice of products -->
+                      <xs:element name = "peikko_psb_product">
+                         <xs:complexType>
+                            <xs:sequence>
+                               <xs:element name="psh"          type="psh_data"        minOccurs="0"  maxOccurs="1"/>
+                            </xs:sequence>
+                            <xs:attribute name="wire_diameter" type="rc_diameter_value" use="required" />
+                            <xs:anyAttribute   processContents="skip"/>
+                         </xs:complexType>
+                      </xs:element>
+                    </xs:choice>
+                 </xs:sequence>
+                 <!-- common attribs -->
+                 <xs:attribute name="pattern"              type="studrail_patterns"   default="semi-orthogonal" />
+                 <xs:attribute name="s0"                   type="studrail_s0_range"   default="0.075"   />
+                 <xs:attribute name="s1"                   type="studrail_s12_range"  default="1.500"  />
+                 <xs:attribute name="s2"                   type="studrail_s12_range"  default="1.500"  />
+                 <xs:attribute name="rails_on_circle"      type="studrail_rail_range" default="12"   />
+                 <xs:attribute name="studs_on_rail"        type="studrail_stud_range" default="3"    />
+                 <xs:attribute name="height"               type="studrail_height"     use="optional" /> <!-- 'automatic', if not given -->
+                 <xs:attribute name="use_minimal_elements" type="xs:boolean"          default="true" />
+                 <xs:anyAttribute   processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        </xs:choice>
+     </xs:sequence>
+     <xs:attributeGroup ref="entity_attribs" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--surface reinforcement types -->
+  <xs:simpleType name="srf_treatment_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="manual"/>
+      <xs:enumeration value="auto_base_net"/>
+      <xs:enumeration value="auto_additional"/>
+      <xs:enumeration value="auto_crack_width"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="surface_rf_type" >
+     <xs:sequence>
+        <xs:element name="base_shell"   type="guid_list_type" />
+        <xs:element name="surface_reinforcement_parameters" type="guid_list_type" />
+        <xs:choice>
+           <xs:element name = "straight">
+              <xs:complexType>
+                 <xs:attribute name="direction" type="direction_type"  use="required" />
+                 <xs:attribute name="space"     type="positive_double" use="required" />
+                 <xs:attribute name="face"      type="sf_rc_face"      use="optional" /> <!-- It needs for dual layer and NOT needs for single layer reinforcements! -->
+                 <xs:attribute name="cover"     type="positive_double" default="0.02" />
+                 <xs:anyAttribute processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        <!-- next choice -->
+           <xs:element name = "centric">
+              <xs:complexType>
+                <xs:choice>
+                   <xs:element name = "radial">
+                      <xs:complexType>
+                         <xs:attribute    name="angle"     type="one_quadrant"    use="required" />
+                         <xs:anyAttribute processContents="skip"/>
+                      </xs:complexType>
+                <!-- next choice -->
+                   </xs:element>
+                   <xs:element name = "tangential">
+                      <xs:complexType>
+                         <xs:attribute name="space"     type="positive_double" use="required" />
+                         <xs:anyAttribute   processContents="skip"/>
+                      </xs:complexType>
+                   </xs:element>
+                </xs:choice>
+                <xs:attribute name="face"      type="sf_rc_face"      use="optional" /> <!-- It needs for dual layer and NOT needs for single layer reinforcements! -->
+                <xs:attribute name="cover"     type="positive_double" default="0.02" />
+                <xs:anyAttribute processContents="skip"/>
+              </xs:complexType>
+           </xs:element>
+        </xs:choice>
+        <xs:element name="wire"   type="rf_wire_type" />
+        <xs:element name="region" type="region_type" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="colour"      type="rgb_color_type"              default="0000a0" /> <!-- From FD22 -->
+    <xs:attribute name="created_by"  type="srf_treatment_type"          default="manual" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="surface_rf_line_type" >
+    <xs:sequence>
+      <xs:element name="start_point" type="point_type_3d" />
+      <xs:element name="end_point"   type="point_type_3d" />
+      <xs:element name="wire"        type="rf_wire_type" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="base_shell"       type="guidtype"               use    ="required" />
+    <xs:attribute name="side"             type="sf_rc_face"             use    ="required" />
+    <xs:attribute name="right_side_wires" type="xs:boolean"             default="true" />
+    <xs:attribute name="pieces"           type="piece_number"           use    ="required" />
+    <xs:attribute name="space"            type="from_1e-4_to_10"        use    ="required" />
+    <xs:attribute name="cover"            type="positive_max_1e17"      use    ="required" />
+    <xs:attribute name="colour"           type="rgb_color_type"         default="0000a0" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="surface_rf_rect_type" >
+    <xs:sequence>
+      <xs:element name="wire"        type="rf_wire_type" />
+      <xs:element name="rectangle"   type="rectangle_type" />
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute name="base_shell"  type="guidtype"                    use    ="required" />
+    <xs:attribute name="side"        type="sf_rc_face"                  use    ="required" />
+    <xs:attribute name="pieces"      type="piece_number"                use    ="required" />
+    <xs:attribute name="cover"       type="positive_max_1e17"           use    ="required" />
+    <xs:attribute name="colour"      type="rgb_color_type"              default="0000a0" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- no-shear region types -->
+  <xs:complexType name="noshear_auto_type" >
+    <xs:attribute      name="connected_structure" type="guidtype"         use    ="required" />
+    <xs:attribute      name="factor"              type="positive_max_100" use    ="required" />
+    <xs:attribute      name="inactive"            type="xs:boolean"       default="false"    />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="noshear_region_type" >
+     <xs:sequence>
+        <xs:choice>
+        <xs:element name="automatic"     type="noshear_auto_type" />
+        <xs:element name="contour"       type="contour_type"  />
+        </xs:choice>
+     </xs:sequence>
+    <xs:attribute      name="base_plate" type="guidtype" use="required" />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- shear control region types -->
+  <xs:complexType name="shear_control_auto_type" >
+    <xs:attribute      name="connected_structure" type="guidtype"         use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="pe_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.01"/>
+      <xs:maxInclusive value="100"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="shear_control_region_type" >
+    <xs:sequence>
+        <xs:choice>
+        <xs:sequence>
+          <xs:element name="automatic"            type="shear_control_auto_type" />
+        </xs:sequence>
+        <xs:sequence>
+          <xs:element name="contour"              type="contour_type" />
+        </xs:sequence>
+      </xs:choice>
+    </xs:sequence>
+    <xs:attribute      name="base_plate"          type="guidtype"       use="required" />
+    <xs:attribute      name="ignore_shear_check"  type="xs:boolean"     use="required" />
+    <xs:attribute      name="x"                   type="non_neg_max_20" use="required" />
+    <xs:attribute      name="physical_extension"  type="pe_type"        use="optional" /> <!-- when used, the default value is 0.01 -->
+    <xs:attribute      name="reduce_shear_forces" type="xs:boolean"     use="required" />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="ssrf_space_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="2"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ssrf_treatment">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="manual"/>
+      <xs:enumeration value="auto"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="surface_shear_rf_type" >
+    <xs:sequence>
+          <xs:element name="wire"                 type="rf_wire_type" />
+          <xs:element name="region"               type="region_type" />
+    </xs:sequence>
+    <xs:attribute      name="base_shell"          type="guidtype"         use="required" />
+    <xs:attribute      name="space_x"             type="ssrf_space_type"  use="required" />
+    <xs:attribute      name="space_y"             type="ssrf_space_type"  use="required" />
+    <xs:attribute      name="colour"              type="rgb_color_type"   default="7b7bcc" />
+    <xs:attribute      name="created_by"          type="ssrf_treatment"   default="manual"/>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ===== Support types  =======================================  -->
+  <!-- base support component -->
+  <xs:complexType name="stiff_base_type">
+    <xs:attribute name="neg" type="stiffnessdata_type" use="required" />
+    <xs:attribute name="pos" type="stiffnessdata_type" use="required" />
+    <xs:anyAttribute processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="simple_rigidity_type">
+    <xs:sequence>
+      <xs:element name="mov"                     type="stiff_base_type" />
+      <xs:element name="rot"                     type="stiff_base_type" />
+      <xs:choice>                                                                                       <!-- From FD17 -->
+        <xs:element name="plastic_limit_forces"  type="plasticity_type"  minOccurs="0" maxOccurs="1" />
+        <xs:element name="plastic_limit_moments" type="plasticity_type"  minOccurs="0" maxOccurs="1" />
+      </xs:choice>
+    </xs:sequence>
+  </xs:complexType>
+
+
+  <xs:complexType name="simple_spring_type">
+    <xs:sequence>
+      <xs:element name="mov_x" type="stiff_base_type" />
+      <xs:element name="rot_x" type="stiff_base_type" />
+      <xs:element name="mov_y" type="stiff_base_type" />
+      <xs:element name="rot_y" type="stiff_base_type" />
+      <xs:element name="mov_z" type="stiff_base_type" />
+      <xs:element name="rot_z" type="stiff_base_type" />
+    </xs:sequence>
+    <xs:attribute name="detach" type="detach_type" default="" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="simple_rigidity_group">
+    <xs:sequence>
+        <xs:element name="springs"               type="stiff_base_type"     minOccurs="10" maxOccurs="10" />
+        <xs:element name="plastic_limits"        type="plasticity_type"     minOccurs="4"  maxOccurs="4" />
+        <xs:element name="plastic_limits2"       type="plasticity_type2"    minOccurs="6"  maxOccurs="6" />
+    </xs:sequence>
+    <xs:attribute name="type"                    type="motion_type"         use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--direction or group based support-->
+  <xs:complexType name="support_rigidity_data_type">
+    <xs:choice>
+      <!-- first choice: simple support type -->
+      <xs:element name="directed">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="direction"               type="point_type_3d" />
+            <xs:choice>
+              <xs:sequence>
+                <xs:element name="mov"                     type="stiff_base_type" />
+                <xs:element name="rot"                     type="stiff_base_type" />
+                <xs:choice>                                                                                       <!-- From FD17 -->
+                  <xs:element name="plastic_limit_forces"  type="plasticity_type"  minOccurs="0" maxOccurs="1" />
+                  <xs:element name="plastic_limit_moments" type="plasticity_type"  minOccurs="0" maxOccurs="1" />
+                </xs:choice>
+              </xs:sequence>
+              <!-- choice from FD20 -->
+              <xs:sequence>
+                <xs:element name="rigidity_group" type="simple_rigidity_group" />
+              </xs:sequence>
+            </xs:choice>
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice:  support group type -->
+      <xs:element name="group">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="local_x"               type="point_type_3d" /> <!-- Not used in import :-), but in the case of export, its value is always equal to the normal vector of the edge. -->
+            <xs:element name="local_y"               type="point_type_3d" />
+            <xs:choice>
+              <xs:sequence> <!-- the only 'choice' for group type before FD18 -->
+                <xs:element name="mov_x"                 type="stiff_base_type" />
+                <xs:element name="rot_x"                 type="stiff_base_type" />
+                <xs:element name="mov_y"                 type="stiff_base_type" />
+                <xs:element name="rot_y"                 type="stiff_base_type" />
+                <xs:element name="mov_z"                 type="stiff_base_type" />
+                <xs:element name="rot_z"                 type="stiff_base_type" />
+                <xs:element name="plastic_limit_forces"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+                <xs:element name="plastic_limit_moments" type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+              </xs:sequence>
+              <!-- new choices from FD18 -->
+              <xs:element name="rigidity"                type="rigidity_data_type2" />
+              <xs:element name="predefined_rigidity"     type="reference_type" />
+              <!-- new choice from FD20 -->
+              <xs:element   name="rigidity_group"        type="rigidity_group_type2"/>
+            </xs:choice>
+          </xs:sequence>
+          <xs:attribute name="detach"  type="detach_type" default="" />
+          <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    </xs:choice>
+  </xs:complexType>
+
+  <!--point support type -->
+  <xs:complexType name="point_support_type">
+    <xs:complexContent>
+      <xs:extension base="support_rigidity_data_type">
+        <xs:sequence>
+          <xs:element name="position"       type="point_type_3d" />
+          <xs:element name="colouring"      type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+        </xs:sequence>
+        <xs:attributeGroup ref="entity_attribs" />
+        <xs:attribute      name="name"      type="identifier"    default="S" />
+        <xs:attribute      name="stage"     type="stage_number"  default="1" />          <!-- From FD21.00.003 -->
+        <xs:attribute      name="end_stage" type="stage_data  "  default="last_stage" /> <!-- From FD22 -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!--line support type-->
+  <xs:complexType name="line_support_type">
+    <xs:complexContent>
+      <xs:extension base="support_rigidity_data_type">
+        <xs:sequence>
+          <xs:element name="edge"   type="edge_type" />
+          <xs:element name="normal" type="point_type_3d" minOccurs="0" />
+          <xs:element name="colouring"         type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+        </xs:sequence>
+        <xs:attributeGroup ref="entity_attribs" />
+        <xs:attribute      name="name"         type="identifier"    default="S" />
+        <xs:attribute      name="moving_local" type="xs:boolean"    default="false" />
+        <xs:attribute      name="stage"        type="stage_number"  default="1" />          <!-- From FD21.00.003 -->
+        <xs:attribute      name="end_stage"    type="stage_data"    default="last_stage" /> <!-- From FD22 -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- Surface support types -->
+
+  <xs:complexType name="surface_support_type">
+    <xs:sequence>
+      <xs:element name="region"                type="region_type" />
+      <xs:choice>
+        <!-- the only 'choice' before FD18 -->
+        <xs:sequence>
+          <xs:element name="mov_x"                 type="stiff_base_type" />
+          <xs:element name="mov_y"                 type="stiff_base_type" />
+          <xs:element name="mov_z"                 type="stiff_base_type" />
+          <xs:element name="plastic_limit_forces"  type="plasticity_type_3d" minOccurs="0" maxOccurs="1" />  <!-- From FD17 -->
+        </xs:sequence>
+        <!-- new choices fom FD18: -->
+        <xs:element   name="rigidity"              type="rigidity_data_type1" />
+        <xs:element   name="predefined_rigidity"   type="reference_type" />  <!-- GUID refers to a rigidity_datalib_type_1 item -->
+        <!-- new choice fom FD20: -->
+        <xs:element   name="rigidity_group"        type="rigidity_group_type1" />
+      </xs:choice>
+      <xs:element     name="local_system"          type="opt_localsys_type"     minOccurs="0" maxOccurs="1" /> <!-- From FD19.00.004 -->
+      <xs:element     name="colouring"             type="entity_color"          minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"      type="identifier"   default="S" />
+    <xs:attribute      name="detach"    type="detach_type"  default="" />
+    <xs:attribute      name="stage"     type="stage_number" default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage" type="stage_data"   default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="stiffness_point_type"> <!-- From FD20 -->
+    <xs:sequence>
+      <xs:choice>
+        <xs:element   name="rigidity"              type="rigidity_data_type0" />
+        <xs:element   name="rigidity_group"        type="rigidity_group_type0" />
+      </xs:choice>
+    </xs:sequence>
+    <xs:attribute      name="surface_support"      type="guidtype"   use="required" />
+    <xs:attributeGroup ref="coord3d" />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                 type="identifier" use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ============  PTC  ======================================================== -->
+
+  <xs:simpleType name="ptc_jacking_side">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="start"/>
+      <xs:enumeration value="end"/>
+      <xs:enumeration value="start_then_end"/>
+      <xs:enumeration value="end_then_start"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="ptc_strand_lib_type">
+    <xs:sequence>
+      <xs:element name="ptc_strand_data" >
+        <xs:complexType>
+          <xs:attribute      name="f_pk"             type="min_1_max_10000"    use="required" />
+          <xs:attribute      name="A_p"              type="min_1_max_10000"    use="required" />
+          <xs:attribute      name="E_p"              type="min_1_max_1e7"      use="required" />
+          <xs:attribute      name="density"          type="positive_max_10000" use="required" />
+          <xs:attribute      name="relaxation_class" type="int_1_to_3"         use="required" />
+          <xs:attribute      name="Rho_1000"         type="positive_max_100"   use="required" />
+          <xs:anyAttribute                           processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+    </xs:sequence>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptc_losses">
+    <xs:attribute      name="curvature_coefficient"  type="non_neg_max_10"    use="required" />
+    <xs:attribute      name="wobble_coefficient"     type="non_neg_max_10"    use="required" />
+    <xs:attribute      name="anchorage_set_slip"     type="non_neg_max_100"   use="required" />
+    <xs:attribute      name="elastic_shortening"     type="non_neg_max_1e7"   use="required" />
+    <xs:attribute      name="creep_stress"           type="non_neg_max_1e7"   use="required" />
+    <xs:attribute      name="shrinkage_stress"       type="non_neg_max_1e7"   use="required" />
+    <xs:attribute      name="relaxation_stress"      type="non_neg_max_1e7"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="ptc_tangent_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1.5533430342749533" /> <!-- -89 degree -->
+      <xs:maxInclusive value= "1.5533430342749533" /> <!-- +89 degree -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="ptc_shape_start">
+    <xs:attribute      name="z"                      type="abs_max_1000"      use="required" />
+    <xs:attribute      name="tangent"                type="ptc_tangent_type"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptc_shape_inner">
+    <xs:attribute      name="pos"                  type="inner_position_type" use="required" /> <!-- relative position between first base point and last base point -->
+    <xs:attribute      name="z"                    type="abs_max_1000"        use="required" />
+    <xs:attribute      name="tangent"              type="ptc_tangent_type"    use="required" />
+    <xs:attribute      name="prior_inflection_pos" type="position_type"       use="optional" />  <!-- relative position between prior base point and this base point -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptc_shape_end">
+    <xs:attribute      name="z"                    type="abs_max_1000"      use="required" />
+    <xs:attribute      name="tangent"              type="ptc_tangent_type"  use="required" />
+    <xs:attribute      name="prior_inflection_pos" type="position_type"     use="optional" /> <!-- relative position between prior base point and this base point -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptc_shape_type">
+    <xs:sequence>
+      <xs:element name="start_point"            type="ptc_shape_start" />
+      <xs:element name="intermediate_point"     type="ptc_shape_inner"        minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="end_point"              type="ptc_shape_end" />
+    </xs:sequence>
+    <xs:attribute      name="top"               type="abs_max_10"             use="required" />
+    <xs:attribute      name="bottom"            type="abs_max_10"             use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="position_list_type">
+    <xs:list itemType="position_type"/>
+  </xs:simpleType>
+
+  <xs:complexType name="ptc_manufacturing_type">
+    <xs:sequence>
+      <xs:element name="positions"               type="position_list_type" />
+    </xs:sequence>
+    <xs:attribute      name="shift_x"            type="abs_max_1000"          use="required" />
+    <xs:attribute      name="shift_z"            type="abs_max_1000"          use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ptc_type">
+    <xs:sequence>
+      <xs:element name="start_point"            type="point_type_3d"  />
+      <xs:element name="end_point"              type="point_type_3d"  />
+      <xs:element name="local_z"                type="point_type_3d"          minOccurs="0"  />
+      <xs:element name="losses"                 type="ptc_losses"     />
+      <xs:element name="shape_base_points"      type="ptc_shape_type" />
+      <xs:element name="manufacturing"          type="ptc_manufacturing_type" />
+      <xs:element name="colouring"              type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="base_object"       type="guidtype"         use="required" />
+    <xs:attribute      name="name"              type="identifier"       default="PTC"  />
+    <xs:attribute      name="strand_type"       type="guidtype"         use="required" />
+    <xs:attribute      name="number_of_strands" type="int_1_to_100"     use="required" />
+    <xs:attribute      name="jacking_side"      type="ptc_jacking_side" use="required" />
+    <xs:attribute      name="jacking_stress"    type="min_200_max_1e7"  use="required" />
+    <xs:attribute      name="stage"             type="stage_number"     default="1" />          <!-- From FD21.00.003 -->
+    <xs:attribute      name="end_stage"         type="stage_data"       default="last_stage" /> <!-- From FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ============  Loads & vicinity ============================================ -->
+  <!--load dir type-->
+  <xs:simpleType name="load_dir_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="constant"/>
+      <xs:enumeration value="changing"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--auto load types-->
+  <xs:simpleType name="auto_force_sign_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="plus"/>
+      <xs:enumeration value="minus"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="auto_force_type_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="snow"/>
+      <xs:enumeration value="wind"/>
+      <xs:enumeration value="deviation"/>
+      <xs:enumeration value="notional"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--force loads' type-->
+  <xs:simpleType name="force_load_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="force"/>
+      <xs:enumeration value="moment"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--surf. motion loads' type-->
+  <xs:simpleType name="motion_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="motion"/>
+      <xs:enumeration value="rotation"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!--load combination type-->
+  <xs:simpleType name="loadcombtype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="ultimate_ordinary"/>
+      <xs:enumeration value="ultimate_accidental"/>
+      <xs:enumeration value="ultimate_seismic"/>
+      <xs:enumeration value="serviceability_characteristic" />  <!-- From FD16 -->
+      <xs:enumeration value="serviceability_quasi_permanent" /> <!-- From FD16 -->
+      <xs:enumeration value="serviceability_frequent" />        <!-- From FD16 -->
+      <xs:enumeration value="serviceability"/>                  <!-- For backward compatibility, same as "serviceability_characteristic"  -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="lc_ptc_type"> <!-- From FD19 -->
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="ptc_t0"/>
+      <xs:enumeration value="ptc_t8"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="lc_pile_type"> <!-- From FD20 -->
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="ldcase_pile"/> <!-- intead of "Neg, Shaft friction" -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="lc_final_cs"> <!-- From FD21.00.003 -->
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="final_cs"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="lc_cs"> <!-- From FD21.00.003 -->
+    <xs:restriction base="xs:string">
+      <xs:pattern value="cs.[1-9]{1}[0-9]{0,4}"/> <!-- from "cs.1" to "cs.99999"  -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="load_case_id" >  <!-- for refering all types of load cases, from FD19 -->
+    <xs:union memberTypes="guidtype indexed_guid lc_ptc_type lc_pile_type lc_final_cs" />  <!-- lc_final_cs from FD21.00.003 -->
+  </xs:simpleType>
+
+  <xs:simpleType name="load_case_cs_pe" >  <!-- for refering Construction Stages' and Periodic excitation's load cases, from FD21.00.003 -->
+    <xs:union memberTypes="guidtype indexed_guid lc_ptc_type lc_pile_type" />
+  </xs:simpleType>
+
+  <xs:simpleType name="cs_case_id" >  <!-- from FD21.00.003 -->
+    <xs:union memberTypes="lc_final_cs lc_cs" />
+  </xs:simpleType>
+
+  <xs:simpleType name="common_load_case" >  <!-- for refering common load cases, from FD19 -->
+    <xs:union memberTypes="guidtype indexed_guid" />
+  </xs:simpleType>
+
+  <xs:attributeGroup name="load_baseattribs">
+    <xs:attribute name="load_case"           type="load_case_id"         use="required"  />  <!-- From FD19, we used guidtype earlier here -->
+    <xs:attribute name="comment"             type="comment_string"       default=""      />
+  </xs:attributeGroup>
+
+  <xs:attributeGroup name="forceload_attribs">
+    <xs:attribute name="load_type"           type="force_load_type"      use="required"  /> <!-- In case of surface loads only "force" allowed -->
+    <xs:attribute name="apply_on_ecc"        type="xs:boolean"           default="false" /> <!-- Valid only for force type loads, not for moment ones - From FD18 -->
+    <xs:attribute name="auto_force_dir"      type="direction_type"       use="optional"  />
+    <xs:attribute name="auto_force_sign"     type="auto_force_sign_type" use="optional"  />
+    <xs:attribute name="auto_force_type"     type="auto_force_type_type" use="optional"  />
+    <xs:attribute name="assigned_structure"  type="guidtype"             use="optional"  /> <!-- From FD18 -->
+  </xs:attributeGroup>
+
+  <!--caseless point load type-->
+  <xs:complexType name="caseless_point_load_type">
+    <xs:sequence>
+      <xs:element name="direction" type="point_type_3d" />
+      <xs:element name="load"      type="location_value" />
+      <xs:element name="colouring" type="entity_color"       minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="forceload_attribs" />
+    <xs:attribute      name="comment"  type="comment_string" default=""      />
+  </xs:complexType>
+
+  <!-- point load type -->
+  <xs:complexType name="point_load_type">
+    <xs:complexContent>
+      <xs:extension   base="caseless_point_load_type">
+        <xs:attribute name="load_case"      type="load_case_id" use="required" />  <!-- From FD19, we used guidtype earlier here -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- point support motion load type, from FD18 -->
+  <xs:complexType name="point_support_load_type">
+    <xs:sequence>
+      <xs:element name="direction"    type="point_type_3d" />
+      <xs:element name="displacement" type="location_value" />
+      <xs:element name="colouring" type="entity_color"   minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:attribute      name="load_type"  type="motion_type" use="required"  />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--caseless line load type-->
+  <xs:complexType name="caseless_line_load_type">
+    <xs:sequence>
+      <xs:element name="edge"      type="edge_type" />
+      <xs:element name="direction" type="point_type_3d" />
+      <xs:element name="normal"    type="point_type_3d"  minOccurs="0" maxOccurs="1" />
+      <xs:element name="load"      type="location_value" minOccurs="2" maxOccurs="2" />
+      <xs:element name="colouring" type="entity_color"   minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="forceload_attribs" />
+    <xs:attribute name="comment"             type="comment_string"     default=""      />
+    <xs:attribute name="load_dir"            type="load_dir_type"      use="required"  />
+    <xs:attribute name="load_projection"     type="xs:boolean"         use="required"  />
+  </xs:complexType>
+
+  <!-- line load type -->
+  <xs:complexType name="line_load_type">
+    <xs:complexContent>
+      <xs:extension   base="caseless_line_load_type">
+        <xs:attribute name="load_case"      type="load_case_id" use="required" />  <!-- From FD19, we used guidtype earlier here -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- line support motion load type, from FD18 -->
+  <xs:complexType name="line_support_load_type">
+    <xs:sequence>
+      <xs:element name="edge"         type="edge_type" />
+      <xs:element name="direction"    type="point_type_3d" />
+      <xs:element name="normal"       type="point_type_3d"       minOccurs="0" maxOccurs="1" />
+      <xs:element name="displacement" type="location_value"      minOccurs="2" maxOccurs="2" />
+      <xs:element name="colouring"    type="entity_color"        minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:attribute name="load_type"    type="motion_type"         use="required"  />
+    <xs:attribute name="load_dir"     type="load_dir_type"       use="required"  />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--pressure load type-->
+  <xs:complexType name="pressure_load_type">
+    <xs:sequence>
+      <xs:element name="region"    type="region_type" />
+      <xs:element name="direction" type="point_type_3d" />
+      <xs:element name="colouring" type="entity_color"           minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:attributeGroup ref="forceload_attribs" />  <!-- load_type must be 'force'! -->
+    <xs:attribute      name="load_projection"   type="xs:boolean"   use="required"  />
+    <xs:attribute      name="z0"                type="abs_max_1e20" use="required"  />
+    <xs:attribute      name="q0"                type="abs_max_1e20" use="required"  />
+    <xs:attribute      name="qh"                type="abs_max_1e20" use="required"  />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--caseless surface load type-->
+  <xs:complexType name="caseless_surface_load_type">
+    <xs:sequence>
+      <xs:element name="region"    type="region_type" />
+      <xs:element name="direction" type="point_type_3d" />
+      <xs:element name="load"      type="location_value" minOccurs="1" maxOccurs="3" />
+      <xs:element name="colouring" type="entity_color"   minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="forceload_attribs" />  <!-- load_type must be 'force'! -->
+    <xs:attribute      name="comment"           type="comment_string" default=""         />
+    <xs:attribute      name="load_projection"   type="xs:boolean"     use    ="required" />
+  </xs:complexType>
+
+  <!-- surface load type -->
+  <xs:complexType name="surface_load_type">
+    <xs:complexContent>
+      <xs:extension   base="caseless_surface_load_type">
+        <xs:attribute name="load_case"      type="load_case_id" use="required" />  <!-- From FD19, we used guidtype earlier here -->
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!--surface support motion load type, from FD18 -->
+  <xs:complexType name="surface_support_load_type">
+    <xs:sequence>
+      <xs:element name="region"         type="region_type" />
+      <xs:element name="direction"      type="point_type_3d" />
+      <xs:element name="displacement"   type="location_value"      minOccurs="1" maxOccurs="3" />
+      <xs:element name="colouring" type="entity_color"             minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attribute name="load_type"      type="motion_type"         use="required"  /> <!-- Write only in FD, only 'motion' allowed! -->
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- surface temperature variation load type, from FD18 -->
+  <xs:complexType name="surface_temperature_load_type">
+    <xs:sequence>
+      <xs:element name="region"      type="region_type" />
+        <xs:choice>
+          <xs:element name="temperature" type="topbottom_value" minOccurs="1" maxOccurs="3" />        <!-- Until FD22.00.001. Warning: The values of top_val and bottom_val are swapped! -->
+          <xs:element name="temperature_values" type="topbottom_value" minOccurs="1" maxOccurs="3" /> <!-- From FD22.00.002, with good values. -->
+        </xs:choice>
+        <xs:element name="colouring"   type="entity_color"    minOccurs="0" maxOccurs="1" />        <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- surface stress load type, from FD18 -->
+  <xs:complexType name="surface_stress_load_type">
+    <xs:sequence>
+      <xs:element name="region"      type="region_type" />
+      <xs:element name="stress"      type="topbottom_value" minOccurs="1" maxOccurs="3" />
+      <xs:element name="direction"   type="point_type_3d" />
+      <xs:element name="colouring"   type="entity_color"    minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- line temperature variation load, from FD18 -->
+  <xs:complexType name="line_temperature_load_type">
+    <xs:sequence>
+      <xs:element name="edge"        type="edge_type" />
+      <xs:element name="direction"   type="point_type_3d" />
+      <xs:element name="normal"      type="point_type_3d"   minOccurs="0" maxOccurs="1" />
+      <xs:element name="temperature" type="topbottom_value" minOccurs="2" maxOccurs="2" />
+      <xs:element name="colouring"   type="entity_color"    minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- line stres load, from FD18 -->
+  <xs:complexType name="line_stress_load_type">
+    <xs:sequence>
+      <xs:element name="edge"        type="edge_type" />
+      <xs:element name="direction"   type="point_type_3d" />
+      <xs:element name="normal"      type="point_type_3d"   minOccurs="0" maxOccurs="1" />
+      <xs:element name="stress"      type="topbottom_value" minOccurs="2" maxOccurs="2" />
+      <xs:element name="colouring"   type="entity_color"    minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attributeGroup ref="load_baseattribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- mass point type,  from FD19 -->
+  <xs:complexType name="mass_point_type">
+    <xs:sequence>
+      <xs:element name="position" type="point_type_3d" />
+      <xs:element name="colouring"                type="entity_color"         minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="value"               type="mass_value" />
+    <xs:attribute      name="apply_on_ecc"        type="xs:boolean"           default="false" />
+    <xs:attribute      name="comment"             type="xs:string"            default=""      />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- mass conversion type, from FD19 -->
+  <xs:complexType name="mass_conversion_type">
+    <xs:sequence>
+      <xs:element name="conversion" minOccurs="1" maxOccurs="unbounded" >
+         <xs:complexType>
+           <xs:attribute      name="factor"       type="positive_max_10"      use="required" />
+           <xs:attribute      name="load_case"    type="guidtype"             use="required" />
+           <xs:anyAttribute   processContents="skip"/>
+         </xs:complexType>
+      </xs:element>
+    </xs:sequence>
+    <xs:attribute name="last_change"   type="xs:dateTime"       use="required" />
+    <xs:attribute name="action"        type="modification_type" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- footfall analysis data, from FD19 -->
+  <xs:complexType name="footfall_type">
+    <xs:sequence>
+    	<xs:choice>
+    		<xs:element name="position"  type="point_type_3d" />
+    		<xs:element name="contour"   type="contour_type"  /> <!-- only for pre-FD20.00.004 items! -->
+    		<xs:element name="region"    type="region_type"  />  <!-- From FD20.00.004 -->
+    	</xs:choice>
+    	<xs:element name="colouring" type="entity_color"     minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attribute      name="comment"             type="xs:string"            default=""      />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"                type="identifier"           use="optional"  />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- seismic data types, from FD19 -->
+
+  <xs:simpleType name="seismic_ground_type">
+    <xs:restriction base="xs:string">
+    <xs:enumeration value="A" />
+    <xs:enumeration value="B" />
+    <xs:enumeration value="C" />
+    <xs:enumeration value="D" />
+    <xs:enumeration value="E" />
+    <xs:enumeration value="S1/S2_6-20m"   /> <!-- From FD23.00.004, only for Norwegian Code -->
+    <xs:enumeration value="S1/S2_20-35mA" /> <!-- From FD23.00.004, only for Norwegian Code -->
+    <xs:enumeration value="S1/S2_35-60mA" /> <!-- From FD23.00.004, only for Norwegian Code -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="spectratype_type">
+    <xs:restriction base="xs:int">
+      <xs:minInclusive value="1"/>
+      <xs:maxInclusive value="2"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ec40_tc_type">
+    <xs:restriction base="xs:double">
+      <xs:enumeration value="0.7"/>
+      <xs:enumeration value="1.0"/>
+      <xs:enumeration value="1.6"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:attributeGroup name="spectra_base_attribs">
+    <xs:attribute name="ag"   type="non_neg_max_10"   use="required" />
+    <xs:attribute name="TD"   type="positive_max_10"  use="required" />
+    <xs:attribute name="q"    type="positive_max_10"  use="required" />
+  </xs:attributeGroup>
+
+  <xs:complexType name="standard_spectra_type">
+    <xs:attributeGroup ref ="spectra_base_attribs" />
+    <xs:attribute      name="type" type="spectratype_type" use="required" />
+    <xs:attribute      name="S"    type="positive_max_10"  use="required" />
+    <xs:attribute      name="TB"   type="positive_max_10"  use="required" />
+    <xs:attribute      name="TC"   type="positive_max_10"  use="required" />
+    <xs:attribute      name="beta" type="positive_max_10"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ec040_standard_spectra_type">
+    <xs:attributeGroup ref ="spectra_base_attribs" />
+    <xs:attribute      name="TC"   type="ec40_tc_type"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="spectra_record_type">
+    <xs:attribute      name="T"    type="positive_max_1000" use="required" />
+    <xs:attribute      name="Sd"   type="non_neg_max_1000"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="unique_spectra_type">
+    <xs:sequence>
+      <!-- Important: The first (T = 0.0) diagram record is not stored here  -->
+      <xs:element name="record"   type="spectra_record_type" minOccurs="0" maxOccurs="127" />
+    </xs:sequence>
+    <!-- Important: This is the first (T = 0.0) diagram record's 'Sd' value:  -->
+    <xs:attribute name="start_Sd" type="non_neg_max_1000"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="seismic_load_type">
+    <xs:choice> <!-- EC common standard spectra -->
+      <xs:element name="common_standard_spectra" >
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="horizontal" type="standard_spectra_type" />
+            <xs:element name="vertical"   type="standard_spectra_type" />
+          </xs:sequence>
+         <xs:attribute name="ground"      type="seismic_ground_type" default="A" />
+         <xs:anyAttribute processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <!-- 2nd choice: Romanian standard spectra -->
+      <xs:element name="ec040_standard_spectra" >
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="horizontal"   type="ec040_standard_spectra_type"   />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element >
+      <!-- 3rd choice: Unique spectra -->
+      <xs:element name="unique_spectra" >
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="horizontal"   type="unique_spectra_type"   />
+            <xs:element name="vertical"     type="unique_spectra_type"   />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element >
+    </xs:choice>
+    <xs:attribute name="last_change"        type="xs:dateTime"         use="required" />
+    <xs:attribute name="action"             type="modification_type"   use="required" />
+    <xs:attribute name="xi"                 type="non_neg_max_50"      use="required" />
+    <xs:attribute name="qd"                 type="non_neg_max_10"      use="required" />
+    <xs:attribute name="building_structure" type="xs:boolean"          default="true" />
+    <xs:attribute name="Gamma_Ie"           type="min_half_max_10"     default="1.0"  /> <!-- Only for Romanian Code -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="th_diagram_record">
+    <xs:attribute name="T"                  type="non_negative_double" use="required" />
+    <xs:attribute name="value"              type="abs_max_1"           use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ga_direction_record">
+    <xs:attribute name="factor"               type="non_neg_max_1000"  use="required" />
+    <xs:attribute name="diagram"              type="name255"           use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ga_combination_type">
+    <xs:sequence>
+      <xs:element name="direction_x"        type="ga_direction_record" />
+      <xs:element name="direction_y"        type="ga_direction_record" />
+      <xs:element name="direction_z"        type="ga_direction_record" />
+    </xs:sequence>
+    <xs:attribute name="name"               type="name255"             use="required" />
+    <xs:attribute name="dt"                 type="positive_max_1000"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ga_diagram_type">
+    <xs:sequence>
+      <!-- Important: The first (T = 0.0, value = 0.0) diagram record is not stored here, but it must be 'read' in import!  -->
+      <xs:element name="record"             type="th_diagram_record"   minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="name"               type="name255"             use="required" />
+    <xs:attribute name="direction"          type="direction_2d_type"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ground_acceleration_type">
+    <xs:sequence>
+      <xs:element name="diagram"            type="ga_diagram_type"     minOccurs="1" maxOccurs="unbounded" />
+      <xs:element name="combination"        type="ga_combination_type" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="last_change"        type="xs:dateTime"         use="required" />
+    <xs:attribute name="action"             type="modification_type"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ef_lcase_record">
+    <xs:attribute name="factor"               type="positive_max_1000" use="required" />
+    <xs:attribute name="diagram"              type="name255"           use="required" />
+    <xs:attribute name="load_case"            type="load_case_id"      use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ef_combination_type">
+    <xs:sequence>
+      <xs:element name="record"             type="ef_lcase_record"     minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="name"               type="name255"             use="required" />
+    <xs:attribute name="dt"                 type="positive_max_1000"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ef_diagram_type">
+    <xs:sequence>
+      <!-- Important: The first (T = 0.0) diagram record is not stored here  -->
+      <xs:element name="record"             type="th_diagram_record"   minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="name"               type="name255"             use="required" />
+    <xs:attribute name="direction"          type="direction_2d_type"   use="required" />
+    <!-- Important: 'start_value' is the first (T = 0.0) diagram record's 'factor' value: -->
+    <xs:attribute name="start_value"        type="abs_max_1"           use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="excitation_force_type">
+    <xs:sequence>
+      <xs:element name="diagram"            type="ef_diagram_type"     minOccurs="1" maxOccurs="unbounded" />
+      <xs:element name="combination"        type="ef_combination_type" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="last_change"        type="xs:dateTime"         use="required" />
+    <xs:attribute name="action"             type="modification_type"   use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="pe_phase_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="sin"/>
+      <xs:enumeration value="cos"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="pe_case_type">
+    <xs:attribute name="factor"             type="non_neg_max_1000"       use="required" />
+    <xs:attribute name="phase"              type="pe_phase_type"          use="required" />
+    <xs:attribute name="load_case"          type="load_case_cs_pe"        use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="pe_record_type">
+    <xs:sequence>
+      <xs:element name="case"               type="pe_case_type"         minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="name"               type="name255"              use="required" />
+    <xs:attribute name="frequency"          type="positive_max_1000"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="periodic_excitation_type">
+    <xs:sequence>
+      <xs:element name="record"             type="pe_record_type"       minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute name="last_change"        type="xs:dateTime"          use="required" />
+    <xs:attribute name="action"             type="modification_type"    use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+  <!-- loadcasetype type -->
+  <xs:simpleType name="loadcasetype_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="static"/>
+      <xs:enumeration value="dead_load"/>
+      <xs:enumeration value="shrinkage"/>
+      <xs:enumeration value="seis_max"/>
+      <xs:enumeration value="seis_sxp"/>
+      <xs:enumeration value="seis_sxm"/>
+      <xs:enumeration value="seis_syp"/>
+      <xs:enumeration value="seis_sym"/>
+      <xs:enumeration value="soil_dead_load"/>
+      <xs:enumeration value="prestressing"/>
+      <xs:enumeration value="fire"/>
+      <xs:enumeration value="deviation"/>
+      <xs:enumeration value="notional"/>
+      <xs:enumeration value="pile"/>
+      <xs:enumeration value="diaphragm"/> <!-- From FD23.00.003 -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- load case duration type -->
+  <xs:simpleType name="loadcasedurationtype">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="permanent"/>
+      <xs:enumeration value="long-term"/>
+      <xs:enumeration value="medium-term"/>
+      <xs:enumeration value="short-term"/>
+      <xs:enumeration value="instantaneous"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- load case type -->
+  <xs:complexType name="load_case_type">
+    <xs:sequence />
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="name"           type="name80"               use="required" />
+    <xs:attribute      name="type"           type="loadcasetype_type"    use="required" />
+    <xs:attribute      name="duration_class" type="loadcasedurationtype" default="permanent" />
+    <xs:attribute      name="position"       type="name79"               use="optional" />  <!-- From FD20 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- special load case item types,  from FD19 -->
+  <xs:complexType name="spec_load_case_item">
+    <xs:sequence />
+    <xs:attribute name="gamma" type="xs:double" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- special load CS case item, from FD21.00.003 -->
+  <xs:complexType name="spec_cs_load_case_item">
+    <xs:sequence />
+    <xs:attribute name="type"  type="cs_case_id" use="required" />
+    <xs:attribute name="gamma" type="xs:double"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- ==== moving load types, from FD19 === -->
+
+  <xs:complexType name="vehicle_lib_type">
+    <xs:sequence> <!-- At least one load is required! -->
+      <xs:element name="point_load"   type="caseless_point_load_type"   minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="line_load"    type="caseless_line_load_type"    minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="surface_load" type="caseless_surface_load_type" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attributeGroup ref="lib_base_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="path_distance_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.1"/>
+      <xs:maxInclusive value="1000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="grid_distance_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.001"/>
+      <xs:maxInclusive value="1000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="path_division_number_type"> <!-- From FD19 -->
+    <xs:attribute      name="value"         type="int_1_to_1000"      use="required"  />
+  </xs:complexType>
+
+  <xs:complexType name="path_division_lengt_type"> <!-- From FD19 -->
+    <xs:attribute      name="value"         type="path_distance_type" use="required"  />
+  </xs:complexType>
+
+  <xs:simpleType name="vshift_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1000.0"/>
+      <xs:maxInclusive value="+1000.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="moving_load_grid_type">
+    <xs:sequence>
+      <xs:element name="local_pos"           type="point_type_3d" />
+      <xs:element name="local_x"             type="point_type_3d" />
+      <xs:element name="local_y"             type="point_type_3d" />
+      <xs:element name="contour"             type="contour_type" />
+    </xs:sequence>
+    <xs:attribute      name="grid_x"         type="grid_distance_type"  use="required"  />
+    <xs:attribute      name="grid_y"         type="grid_distance_type"  use="required"  />
+    <xs:attribute      name="edge_x"         type="abs_max_1000"        use="required"  />
+    <xs:attribute      name="edge_y"         type="abs_max_1000"        use="required"  />
+  </xs:complexType>
+
+  <xs:complexType name="moving_load_type"> <!-- From FD19 -->
+    <xs:sequence>
+      <xs:choice>
+      <!-- Choice: Line moving load -->
+        <xs:sequence>
+          <xs:choice>
+            <xs:element name="division_points"   type="path_division_number_type"  />
+            <xs:element name="division_distance" type="path_division_lengt_type"   />
+           </xs:choice>
+          <!-- Positions are pacings' order -->
+          <xs:element name="path_position"    type="point_type_3d"     minOccurs="2" maxOccurs="unbounded" />
+          <!-- Path segments' local y directions.
+          Required if there is at least one user-specified path segment with a different orientation.
+          (No more than the same number of path segments will be used) -->
+          <xs:element name="local_y"          type="point_type_3d"     minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20 -->
+
+        </xs:sequence>
+        <!-- Choice: Surface moving load, from FD20 -->
+        <xs:sequence>
+          <xs:element name="grid"   type="moving_load_grid_type" />
+        </xs:sequence>
+      </xs:choice>
+      <xs:choice>
+        <!-- 1st choice, from FD20 -->
+        <xs:sequence>
+         <xs:element name="added_vehicle_position"   type="point_type_3d"     minOccurs="0" maxOccurs="unbounded" />
+         <xs:element name="deleted_vehicle_position" type="point_type_3d"     minOccurs="0" maxOccurs="unbounded" />
+        </xs:sequence>
+        <!-- 2nd choice from FD21: -->
+        <xs:sequence>
+         <xs:element name="vehicle_positions"                                 minOccurs="0" maxOccurs="1" >
+           <xs:complexType>
+             <xs:sequence>
+               <xs:element name="position"           type="point_type_3d"     minOccurs="1" maxOccurs="unbounded"/>
+             </xs:sequence>
+           </xs:complexType>
+         </xs:element>
+        </xs:sequence>
+      </xs:choice>
+    </xs:sequence>
+    <xs:attributeGroup ref ="entity_attribs" />
+    <xs:attribute      name="name"            type="name255"     use="required"  />
+    <xs:attribute      name="vehicle"         type="guidtype"    use="required"  />
+    <xs:attribute      name="vehicle_shift_x" type="vshift_type" default="0.0"  />  <!-- From FD20 -->
+    <xs:attribute      name="vehicle_shift_y" type="vshift_type" default="0.0"  />  <!-- From FD20 -->
+    <xs:attribute      name="return"          type="xs:boolean"  default="false" /> <!-- not used in case of surface moving loads -->
+    <xs:attribute      name="lock_direction"  type="xs:boolean"  default="false" />
+    <xs:attribute      name="cut_to_path"     type="xs:boolean"  default="false" /> <!-- means cut to region in case of surface moving loads -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- load combination type -->
+  <xs:complexType name="load_combination_type">
+    <xs:sequence>
+      <xs:element name="load_case" minOccurs="0" maxOccurs="unbounded">
+        <xs:complexType>
+          <xs:attribute name="guid"  type="common_load_case" use="required" />
+          <xs:attribute name="gamma" type="xs:double"        use="required" />
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+      <!-- special load cases of the combination, from FD18 -->
+      <xs:element name="seismic_max"             type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="seismic_res_fx_plus_mx"  type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="seismic_res_fx_minus_mx" type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="seismic_res_fy_plus_my"  type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="seismic_res_fy_minus_my" type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="seismic_res_fz"          type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <!-- special load cases of the combination, from FD19 -->
+      <xs:element name="ptc_t0"                  type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <xs:element name="ptc_t8"                  type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <!-- special load case of the combination, from FD20 -->
+      <xs:element name="ldcase_pile"             type="spec_load_case_item"   minOccurs="0" maxOccurs="1"/>
+      <!-- CS case, from FD21.00.003 -->
+      <xs:element name="cs_case"                 type="spec_cs_load_case_item"   minOccurs="0" maxOccurs="1"/> <!-- From FD21.00.003 -->
+    </xs:sequence>
+    <xs:attributeGroup ref ="entity_attribs" />
+    <xs:attribute      name="name" type="name159"      use="required" />
+    <xs:attribute      name="type" type="loadcombtype" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="ldgroup_relation">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value=""/>
+      <xs:enumeration value="alternative"/>
+      <xs:enumeration value="simultaneous"/>
+      <xs:enumeration value="entire"/>
+      <xs:enumeration value="custom"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="LDG_relation_factor_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-1E20"/>
+      <xs:maxInclusive value="+1E20"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ldgroup_relation_psi_type">
+    <xs:list itemType="non_neg_max_100"/>
+  </xs:simpleType>
+
+  <xs:simpleType name="ldgroup_relation_list_type">
+    <xs:list itemType="LDG_relation_factor_type"/>
+  </xs:simpleType>
+
+  <xs:complexType name="ldgroup_relation_record_type">
+    <xs:attribute    name="name"         type="name79"                     use="required" />
+    <xs:attribute    name="psi_override" type="ldgroup_relation_psi_type"  use="optional" /> <!-- from FD23.00.004. Only for "Temporary" load groups. If it exists, the number of elements is always 3! -->
+    <xs:attribute    name="factors"      type="ldgroup_relation_list_type" use="required" />
+    <xs:anyAttribute processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="ldgroup_relation_table">
+    <xs:sequence>
+      <xs:element name="record" type="ldgroup_relation_record_type"  minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!-- Load groups' subgroup, From FD20: -->
+  <xs:complexType name = "load_subgroup">
+     <xs:sequence>
+        <xs:element name="load_case"   type="reference_type" minOccurs="0" maxOccurs="unbounded" />
+        <xs:element name="ptc_t0"      type="empty_type"     minOccurs="0" maxOccurs="1" />
+        <xs:element name="ptc_t8"      type="empty_type"     minOccurs="0" maxOccurs="1" />
+        <xs:element name="ldcase_pile" type="empty_type"     minOccurs="0" maxOccurs="1" />
+        <xs:element name="final_cs"    type="empty_type"     minOccurs="0" maxOccurs="1" /> <!-- from FD21.00.003 -->
+     </xs:sequence>
+     <xs:attribute      name="name"     type="name79"    use="required" />
+     <xs:attribute      name="master"   type="guidtype"  use="optional" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--load group types,  from FD18 -->
+  <xs:attributeGroup name="ldgroup_attribs">
+    <xs:attribute name="name"             type="name79"           use="required" />        <!-- Do not modify the name of moving load's temporary subgroup; it must be equal with one of its subgroups's name! -->
+    <xs:attribute name="guid"             type="guidtype"         use="required" />
+    <xs:attribute name="consider_in_gmax" type="xs:boolean"	      default="true" />        <!-- From FD20 -->
+  </xs:attributeGroup>
+
+  <xs:simpleType name="ldgrpcustomtable_number">
+    <xs:restriction base="xs:double">
+      <xs:minExclusive value="-1e14"/>
+      <xs:maxExclusive value="1e14"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_ss">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="mandatory"/>
+      <xs:enumeration value="optional" />
+      <xs:enumeration value="deactivated" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_acc">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="factorless"/>
+      <xs:enumeration value="Gamma_A"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_accidental" >
+    <xs:union memberTypes="method_acc  ldgrpcustomtable_number" />
+  </xs:simpleType>
+
+  <xs:complexType name="accidental_load_group">
+     <xs:sequence>
+        <xs:element name="custom_table"                      minOccurs="0" maxOccurs="1">       <!-- From FD22, mandatory for Custom combination method -->
+          <xs:complexType>
+             <xs:sequence>
+               <xs:element name="record"                     minOccurs="1" maxOccurs="unbounded">
+                 <xs:complexType>
+                   <xs:attribute name ="s"    type="method_ss"          use="required" />
+                   <xs:attribute name ="data" type="method_accidental"  use="required" />
+                   <xs:anyAttribute   processContents="skip"/>
+                 </xs:complexType>
+               </xs:element>
+             </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+         <!-- At least one of the following load case elements is required! -->
+        <xs:element name="load_case"   type="reference_type" minOccurs="0" maxOccurs="unbounded" />
+        <xs:element name="ptc_t0"      type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD19 -->
+        <xs:element name="ptc_t8"      type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD19 -->
+        <xs:element name="ldcase_pile" type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD20 -->
+        <xs:element name="final_cs"    type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- from FD21.00.003 -->
+
+        <xs:element name="subgroup"  type="load_subgroup"          minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20: -->
+        <xs:element name="relations" type="ldgroup_relation_table" minOccurs="0" maxOccurs="1" />         <!-- From FD20, used only for custom relationship -->
+     </xs:sequence>
+     <xs:attribute      name="safety_factor"    type="positive_max_10"  use="required" />
+     <xs:attribute      name="using_Psi_1"      type="xs:boolean"       default="true" />        <!-- From FD20 -->
+     <xs:attribute      name="relationship"     type="ldgroup_relation" default="alternative" /> <!-- From FD20 -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="method_per">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="factorless"/>
+      <xs:enumeration value="Gamma_G_Sup"  />
+      <xs:enumeration value="Gamma_G_Inf"  />
+      <xs:enumeration value="Ksi_*_Gamma_G_Sup"  />
+      <xs:enumeration value="Gamma_G_Sup_Accidental"  />
+      <xs:enumeration value="Gamma_G_Inf_Accidental"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_permanent" >
+    <xs:union memberTypes="method_per  ldgrpcustomtable_number" />
+  </xs:simpleType>
+
+  <xs:complexType name = "permanent_load_group">
+     <xs:sequence>
+        <xs:element name="custom_table"                      minOccurs="0" maxOccurs="1">       <!-- From FD22, mandatory for Custom combination method -->
+          <xs:complexType>
+             <xs:sequence>
+               <xs:element name="record"                     minOccurs="1" maxOccurs="unbounded">
+                 <xs:complexType>
+                   <xs:attribute name ="s"    type="method_ss"         use="required" />
+                   <xs:attribute name ="data" type="method_permanent"  use="required" />
+                   <xs:anyAttribute   processContents="skip"/>
+                 </xs:complexType>
+               </xs:element>
+             </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+         <!-- At least one of the following load case elements is required! -->
+        <xs:element name="load_case"   type="reference_type" minOccurs="0" maxOccurs="unbounded" />
+        <xs:element name="ptc_t0"      type="empty_type"     minOccurs="0" maxOccurs="1" />      <!-- From FD19: -->
+        <xs:element name="ptc_t8"      type="empty_type"     minOccurs="0" maxOccurs="1" />      <!-- From FD19: -->
+        <xs:element name="ldcase_pile" type="empty_type"     minOccurs="0" maxOccurs="1" />      <!-- From FD20 -->
+        <xs:element name="final_cs"    type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- from FD21.00.003 -->
+
+        <xs:element name="subgroup"  type="load_subgroup"          minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20: -->
+        <xs:element name="relations" type="ldgroup_relation_table" minOccurs="0" maxOccurs="1" />         <!-- From FD20, used only for custom relationship -->
+     </xs:sequence>
+     <xs:attribute      name="standard_favourable"     type="positive_max_10"  use="required" />
+     <xs:attribute      name="standard_unfavourable"   type="positive_max_10"  use="required" />
+     <xs:attribute      name="accidental_favourable"   type="positive_max_10"  use="required" />
+     <xs:attribute      name="accidental_unfavourable" type="positive_max_10"  use="required" />
+     <xs:attribute      name="xi"                      type="positive_max_10"  use="required" />
+     <xs:attribute      name="relationship"            type="ldgroup_relation" default="alternative" /> <!-- From FD20 -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="method_str">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="factorless"/>
+      <xs:enumeration value="Gamma_P"  />
+      <xs:enumeration value="Gamma_P_Accidental"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_stress" >
+    <xs:union memberTypes="method_str ldgrpcustomtable_number" />
+  </xs:simpleType>
+
+  <xs:complexType name = "stress_load_group">
+     <xs:sequence>
+        <xs:element name="custom_table"                      minOccurs="0" maxOccurs="1">       <!-- From FD22, mandatory for Custom combination method -->
+          <xs:complexType>
+             <xs:sequence>
+               <xs:element name="record"                     minOccurs="1" maxOccurs="unbounded">
+                 <xs:complexType>
+                   <xs:attribute name ="s"    type="method_ss"         use="required" />
+                   <xs:attribute name ="data" type="method_stress"     use="required" />
+                   <xs:anyAttribute   processContents="skip"/>
+                 </xs:complexType>
+               </xs:element>
+             </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+         <!-- At least one of the following load case elements is required! -->
+        <xs:element name="load_case"   type="reference_type" minOccurs="0" maxOccurs="unbounded" />
+        <xs:element name="ptc_t0"      type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD19: -->
+        <xs:element name="ptc_t8"      type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD19: -->
+        <xs:element name="ldcase_pile" type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- From FD20 -->
+        <xs:element name="final_cs"    type="empty_type"     minOccurs="0" maxOccurs="1" />     <!-- from FD21.00.003 -->
+
+        <xs:element name="subgroup"  type="load_subgroup"          minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20: -->
+        <xs:element name="relations" type="ldgroup_relation_table" minOccurs="0" maxOccurs="1" />         <!-- From FD20, used only for custom relationship -->
+     </xs:sequence>
+     <xs:attribute      name="standard"      type="positive_max_10"  use="required" />
+     <xs:attribute      name="accidental"    type="positive_max_10"  use="required" />
+     <xs:attribute      name="relationship"  type="ldgroup_relation" default="alternative" /> <!-- From FD20 -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="method_seis">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="factorless"/>
+      <xs:enumeration value="Gamma_S"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_seismic" >
+    <xs:union memberTypes="method_seis ldgrpcustomtable_number" />
+  </xs:simpleType>
+
+  <xs:complexType name = "seismic_load_group" >
+     <xs:sequence>
+        <xs:element name="custom_table"                      minOccurs="0" maxOccurs="1">       <!-- From FD22, mandatory for Custom combination method -->
+          <xs:complexType>
+             <xs:sequence>
+               <xs:element name="record"                     minOccurs="1" maxOccurs="unbounded">
+                 <xs:complexType>
+                   <xs:attribute name ="s"    type="method_ss"         use="required" />
+                   <xs:attribute name ="data" type="method_seismic"    use="required" />
+                   <xs:anyAttribute   processContents="skip"/>
+                 </xs:complexType>
+               </xs:element>
+             </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+        <xs:element name="load_case" type="reference_type" minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20, but valid only for seismic & normal cases if 'user_defined_cases' = true -->
+     </xs:sequence>
+    <xs:attribute      name="safety_factor"      type="positive_max_10" use="required" />
+    <xs:attribute      name="user_defined_cases" type="xs:boolean"      default="false" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="method_is">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="general"/>
+      <xs:enumeration value="highlighted"/>
+      <xs:enumeration value="simultaneous"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_tmp">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="factorless"/>
+      <xs:enumeration value="Gamma_Q"  />
+      <xs:enumeration value="Psi0"  />
+      <xs:enumeration value="Psi1"  />
+      <xs:enumeration value="Psi2"  />
+      <xs:enumeration value="Gamma_Q_*_Psi0"  />
+      <xs:enumeration value="Gamma_Q_*_Psi1"  />
+      <xs:enumeration value="Gamma_Q_*_Psi2"  />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="method_temporary" >
+    <xs:union memberTypes="method_tmp ldgrpcustomtable_number" />
+  </xs:simpleType>
+
+  <xs:complexType name = "temporary_load_group" >
+    <xs:sequence>
+        <xs:element name="custom_table"                      minOccurs="0" maxOccurs="1">       <!-- From FD22, mandatory for Custom combination method -->
+          <xs:complexType>
+             <xs:sequence>
+               <xs:element name="record"                     minOccurs="1" maxOccurs="unbounded">
+                 <xs:complexType>
+                   <xs:attribute name ="s"    type="method_ss"         use="required" />
+                   <xs:attribute name ="data" type="method_temporary"  use="required" />
+                   <xs:attribute name ="i"    type="method_is"         use="required" />
+                   <xs:anyAttribute   processContents="skip"/>
+                 </xs:complexType>
+               </xs:element>
+             </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+       <!-- At least one of the following load case elements is required! -->
+      <xs:element name="load_case"                 type="reference_type" minOccurs="0" maxOccurs="unbounded" />
+      <xs:element name="ptc_t0"                    type="empty_type"     minOccurs="0" maxOccurs="1" /> <!-- From FD19: -->
+      <xs:element name="ptc_t8"                    type="empty_type"     minOccurs="0" maxOccurs="1" /> <!-- From FD19: -->
+      <xs:element name="ldcase_pile"               type="empty_type"     minOccurs="0" maxOccurs="1" /> <!-- From FD20 -->
+      <xs:element name="final_cs"                  type="empty_type"     minOccurs="0" maxOccurs="1" /> <!-- from FD21.00.003 -->
+      <xs:element name="load_cases_of_moving_load"                       minOccurs="0" maxOccurs="unbounded"  > <!-- From FD19; from FD20 it automatically makes a new subgroups from FD20 -->
+        <xs:complexType>
+          <xs:attribute      name="guid"           type="guidtype"       use="required"  />
+          <xs:attribute      name="master"         type="guidtype"       use="optional"  /> <!-- From FD20.00.003 -->
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+      </xs:element>
+
+      <xs:element name="subgroup"  type="load_subgroup"          minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20: -->
+      <xs:element name="relations" type="ldgroup_relation_table" minOccurs="0" maxOccurs="1" />         <!-- From FD20, used only for custom relationship -->
+    </xs:sequence>
+
+     <xs:attribute      name="safety_factor"  type="positive_max_10"  use="required"  />
+     <xs:attribute      name="psi_0"          type="non_neg_max_10"   use="required"  />
+     <xs:attribute      name="psi_1"          type="non_neg_max_10"   use="required"  />
+     <xs:attribute      name="psi_2"          type="non_neg_max_10"   use="required"  />
+     <xs:attribute      name="leading_cases"  type="xs:boolean"       default="false" />
+     <xs:attribute      name="ignore_sls"     type="xs:boolean"       default="false" />
+     <xs:attribute      name="simultaneous"   type="xs:boolean"       default="false" />       <!-- From FD19 and ONLY FOR FD19 models' import! -->
+     <xs:attribute      name="relationship"   type="ldgroup_relation" default="alternative" /> <!-- From FD20 -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name = "general_load_group_type" >
+    <xs:sequence>
+      <xs:choice>
+        <xs:element name="accidental"  type="accidental_load_group" />
+        <xs:element name="permanent"   type="permanent_load_group"  />
+        <xs:element name="seismic"     type="seismic_load_group"    />
+        <xs:element name="stress"      type="stress_load_group"     />
+        <xs:element name="temporary"   type="temporary_load_group"  />
+      </xs:choice>
+    </xs:sequence>
+     <xs:attributeGroup ref="ldgroup_attribs" /> <!-- Do not modify the name of moving load's temporary subgroup; it must be equal with one of its subgroups's name! -->
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="ldcombmethod">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value=""/>
+      <xs:enumeration value="false"/>      <!-- same as "EN 1990 6.4.3(6.10.a, b)",  From FD20 -->
+      <xs:enumeration value="true"/>       <!-- same as "EN 1990 6.4.3(6.10)",       From FD20 -->
+      <xs:enumeration value="EN 1990 6.4.3(6.10.a, b)"/> <!-- From FD22 -->
+      <xs:enumeration value="EN 1990 6.4.3(6.10)"/>      <!-- From FD22 -->
+      <xs:enumeration value="custom"/>     <!-- From FD22 -->
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="ldcomblimitstate">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="ultimate"/>
+      <xs:enumeration value="characteristic"/>
+      <xs:enumeration value="accidental"/>
+      <xs:enumeration value="seismic"/>
+      <xs:enumeration value="quasi-permanent"/>
+      <xs:enumeration value="frequent"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name = "ldgrp_rec_type" >
+     <xs:attribute      name="name"        type="name40"            use="required" />
+     <xs:attribute      name="limit_state" type="ldcomblimitstate"  use="required" />
+     <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name = "ldgrp_ct_type" >
+    <xs:sequence>
+      <xs:choice>
+        <xs:element name="record"  type="ldgrp_rec_type" minOccurs="1" maxOccurs="unbounded" />
+      </xs:choice>
+    </xs:sequence>
+  </xs:complexType>
+
+  <!--load group table type, from FD18 -->
+  <xs:complexType name="load_group_table">
+    <xs:sequence>
+        <xs:element name="custom_table"  type="ldgrp_ct_type"    minOccurs="0" maxOccurs="1" />           <!-- from FD22, mandatory for Custom combination method -->
+        <xs:element name="group"         type="general_load_group_type"  minOccurs="1" maxOccurs="unbounded" />
+    </xs:sequence>
+    <!-- No GUID defined, the FD contains only one load group table. -->
+    <xs:attribute   name="last_change"               type="xs:dateTime"   use="required" />
+    <xs:attribute   name="simple_combination_method" type="ldcombmethod"  default="EN 1990 6.4.3(6.10)" /> <!-- from FD22 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+  <xs:complexType name="wl_nt_type">
+    <xs:attribute name="mult_factor" type="positive_max_100"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_t_type">
+    <xs:attribute name="mult_factor"      type="positive_max_100"  use="required" />
+    <xs:attribute name="turbulence"       type="xs:boolean"        use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_st_type">
+    <xs:attribute name="suction_factor"   type="positive_max_100"  use="required" />
+    <xs:attribute name="turbulence"       type="xs:boolean"        use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="bs_type">
+    <xs:attribute name="guid"   type="guidtype"  use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_external_wall_type">
+    <xs:sequence>
+        <xs:element name="at_0_degree"     type="wl_nt_type" />
+        <xs:element name="at_90_degree"    type="wl_t_type" />
+        <xs:element name="at_180_degree"   type="wl_nt_type" />
+        <xs:element name="at_270_degree"   type="wl_t_type" />
+        <xs:choice>
+          <xs:element name="base_shell"    type="bs_type"  minOccurs="1" maxOccurs="unbounded" />
+          <xs:element name="region"        type="region_type" />  <!-- From FD21.00.006 -->
+        </xs:choice>
+        <xs:element name="direction_point" type="point_type_3d" />
+        <xs:element name="colouring"       type="entity_color"    minOccurs="0" maxOccurs="1" />        <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="load_stripes" type="int_1_to_1000" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_flat_roof_type">
+    <xs:sequence>
+        <xs:element name="at_0_degree"    type="wl_t_type" />
+        <xs:element name="at_90_degree"   type="wl_t_type" />
+        <xs:element name="at_180_degree"  type="wl_t_type" />
+        <xs:element name="at_270_degree"  type="wl_t_type" />
+        <xs:choice>
+          <xs:element name="base_shell"   type="bs_type"   minOccurs="1" maxOccurs="unbounded" />
+          <xs:element name="region"       type="region_type" />  <!-- From FD21.00.006 -->
+        </xs:choice>
+        <xs:element name="colouring"      type="entity_color"    minOccurs="0" maxOccurs="1" />        <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="angle"              type="full_circle"     use="required" />
+    <xs:attribute      name="attic_walls_height" type="non_neg_max_100" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_leanto_type">
+    <xs:sequence>
+        <xs:element name="at_0_degree"    type="wl_st_type" />
+        <xs:element name="at_90_degree"   type="wl_t_type" />
+        <xs:element name="at_180_degree"  type="wl_t_type" />
+        <xs:element name="at_270_degree"  type="wl_t_type" />
+        <xs:choice>
+          <xs:element name="base_shell"   type="bs_type"   minOccurs="1" maxOccurs="unbounded" />
+          <xs:element name="region"       type="region_type" />  <!-- From FD21.00.006 -->
+        </xs:choice>
+        <xs:element   name="colouring"    type="entity_color"    minOccurs="0" maxOccurs="1" />        <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute      name="pressure_factor" type="positive_max_100" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="wl_ridge_roof_type">
+    <xs:sequence>
+        <xs:element name="at_0_degree"    type="wl_t_type" />
+        <xs:element name="at_90_degree"   type="wl_t_type" />
+        <xs:element name="at_180_degree"  type="wl_t_type" />
+        <xs:element name="at_270_degree"  type="wl_t_type" />
+        <xs:choice>
+          <xs:element name="base_shell"   type="bs_type"   minOccurs="1" maxOccurs="unbounded" />
+          <xs:element name="region"       type="region_type" />  <!-- From FD21.00.006 -->
+        </xs:choice>
+        <xs:element name="colouring"      type="entity_color"    minOccurs="0" maxOccurs="1" />        <!-- From FD23 -->
+    </xs:sequence>
+    <xs:attributeGroup ref="entity_attribs" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="fdarc3_type">
+    <xs:sequence>
+      <xs:element name="centre"           type="point_type_3d" />
+      <xs:element name="local_x"          type="point_type_3d" />
+      <xs:element name="local_y"          type="point_type_3d" />
+    </xs:sequence>
+    <xs:attribute      name="radius"      type="positive_max_1e23" use="required"/>
+    <xs:attribute      name="start_angle" type="full_circle"       use="required" />
+    <xs:attribute      name="end_angle"   type="full_circle"       use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+  <!-- =============  Geometry types  ============================== -->
+  <xs:simpleType name="pointstyle_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="cross" />
+      <xs:enumeration value="plus_sign" />
+      <xs:enumeration value="diamond" />
+      <xs:enumeration value="square" />
+      <xs:enumeration value="dot" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="fillmode_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="auto_fill" />
+      <xs:enumeration value="colour" />
+      <xs:enumeration value="no_fill" />
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="fill_type">
+    <xs:attribute      name="mode"       type="fillmode_type"  default="auto_fill" />
+    <xs:attribute      name="colour"     type="rgb_color_type" default="000000"    />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="penwidth_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="0.0"/>
+      <xs:maxInclusive value="1E23"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="slant_type">
+    <xs:restriction base="xs:double">
+      <xs:minInclusive value="-80.0"/>
+      <xs:maxInclusive value="+80.0"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="script_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="default"/>
+      <xs:enumeration value="Arabic"/>
+      <xs:enumeration value="Baltic"/>
+      <xs:enumeration value="CE"/>
+      <xs:enumeration value="Cyrillik"/>
+      <xs:enumeration value="Greek"/>
+      <xs:enumeration value="Hebrew"/>
+      <xs:enumeration value="OEM/DOS"/>
+      <xs:enumeration value="symbol"/>
+      <xs:enumeration value="Thai"/>
+      <xs:enumeration value="Turkish"/>
+      <xs:enumeration value="Vietnamese"/>
+      <xs:enumeration value="Western"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- dimtext font type-->
+  <xs:complexType      name="font_type">
+    <xs:attribute      name="font"          type="xs:string"         default="Tahoma" />
+    <xs:attribute      name="script"        type="script_type"       default="Western" />
+    <xs:attribute      name="size"          type="positive_max_1e23" default="0.004" />
+    <xs:attribute      name="width"         type="positive_max_10"   default="1.0" />
+    <xs:attribute      name="slant"         type="slant_type"        default="0.0" />
+    <xs:attribute      name="bold"          type="xs:boolean"        default="false" /> <!-- From FD23 -->
+    <xs:attribute      name="italic"        type="xs:boolean"        default="false" /> <!-- From FD23 -->
+    <xs:attribute      name="underline"     type="xs:boolean"        default="false" /> <!-- From FD23 -->
+    <xs:attribute      name="strikethrough" type="xs:boolean"        default="false" /> <!-- From FD23 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--text font type-->
+  <xs:complexType      name="text_font_type">
+    <xs:complexContent>
+      <xs:extension base="font_type">
+        <xs:attribute      name="h_align"   type="hor_align"    default="left" />
+        <xs:attribute      name="v_align"   type="ver_align"    default="bottom" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <!-- style type for geometry -->
+  <xs:complexType name="style_type">
+    <xs:sequence>
+       <xs:element name="filling" type="fill_type"      minOccurs="0" maxOccurs="1" />
+       <xs:element name="font"    type="text_font_type" minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute      name="layer"       type="layer_name"      default="0" />
+    <xs:attribute      name="colour"      type="rgb_color_type"  default="000000"/>
+    <xs:attribute      name="line_style"  type="name255"         default="CONTINUOUS"     />
+    <xs:attribute      name="penwidth"    type="abs_max_10000"   default="0"     />
+    <xs:attribute      name="point_style" type="pointstyle_type" default="cross" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- point type for geometry -->
+  <xs:complexType name="point_type">
+    <xs:sequence>
+       <xs:element name="location" type="point_type_3d" />
+       <xs:element name="style"    type="style_type" minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+  </xs:complexType>
+
+  <!-- solid type for geometry - this is the representation of SOLID, not TSOLID -->
+  <xs:complexType name="solid_type">
+    <xs:sequence>
+      <xs:element name="facets"  type="region_group_type" />
+      <xs:element name="style"   type="style_type" minOccurs="0" maxOccurs="1" />
+    </xs:sequence>
+    <xs:attribute      name="guid" type="guidtype" use="optional" /> <!-- but required for graphics solids! From FD21 -->
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- curve type for geometry -->
+  <xs:complexType name="curve_type">
+    <xs:complexContent>
+      <xs:extension base="edge_type">
+        <xs:sequence>
+          <xs:element name="style"  type="style_type" minOccurs="0" maxOccurs="1" />
+        </xs:sequence>
+      </xs:extension>
+    </xs:complexContent>
+  </xs:complexType>
+
+  <xs:simpleType name="lengthunit_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="mm"/>
+      <xs:enumeration value="cm"/>
+      <xs:enumeration value="dm"/>
+      <xs:enumeration value="m"/>
+      <xs:enumeration value="inch"/>
+      <xs:enumeration value="feet"/>
+      <xs:enumeration value="yd"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="angleunit_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="degree"/>
+      <xs:enumeration value="rad"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="halign_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="centered"/>
+      <xs:enumeration value="1st_ext_line"/>
+      <xs:enumeration value="2nd_ext_line"/>
+      <xs:enumeration value="under_1st_ext_line"/>
+      <xs:enumeration value="over_2nd_ext_line"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:simpleType name="valign_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="above"/>
+      <xs:enumeration value="outside"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <!-- dimtext for geometry -->
+  <xs:complexType name="dimtext_type">
+    <xs:sequence>
+      <xs:element name="position" type="point_type_3d" />
+      <xs:element name="plane_x"  type="point_type_3d" />
+      <xs:element name="plane_y"  type="point_type_3d" />
+    </xs:sequence>
+    <xs:attribute      name="value"               type="xs:double"       use="required"/>
+    <xs:attribute      name="text"                type="name255"         use="optional"/>
+    <xs:attribute      name="decimals"            type="int_0_to_10"     default="2"/>
+    <xs:attribute      name="length_unit"         type="lengthunit_type" default="m"/>
+    <xs:attribute      name="angle_unit"          type="angleunit_type"  default="rad"/>
+    <xs:attribute      name="measurement_unit"    type="xs:boolean"      default="false"/>
+    <xs:attribute      name="prefix"              type="name15"          default=""/>
+    <xs:attribute      name="suffix"              type="name15"          default=""/>
+    <xs:attribute      name="colour"              type="rgb_color_type"  default="000000"/>
+    <xs:attribute      name="h_align"             type="halign_type"     default="centered"     />
+    <xs:attribute      name="v_align"             type="valign_type"     default="above"     />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- arrow for geometry -->
+  <xs:simpleType name="arrowtype_type">
+    <xs:restriction base="xs:string">
+      <xs:enumeration value="open"/>
+      <xs:enumeration value="close"/>
+      <xs:enumeration value="break"/>
+      <xs:enumeration value="fill"/>
+      <xs:enumeration value="circle"/>
+      <xs:enumeration value="dot"/>
+      <xs:enumeration value="tick"/>
+    </xs:restriction>
+  </xs:simpleType>
+
+  <xs:complexType name="arrow_type">
+    <xs:attribute      name="type"        type="arrowtype_type"      default="tick" />
+    <xs:attribute      name="size"        type="non_neg_max_1e23"    default="0.005" />
+    <xs:attribute      name="penwidth"    type="non_neg_max_1e23"    default="0.00018"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="line_type">
+      <xs:sequence>
+        <xs:element name="start" type="point_type_3d" />
+        <xs:element name="end"   type="point_type_3d" />
+      </xs:sequence>
+  </xs:complexType>
+
+  <xs:complexType name="dimdimline_type">
+    <xs:attribute      name="extension_a" type="non_neg_max_1e23"    default="0.005"/>
+    <xs:attribute      name="penwidth"    type="non_neg_max_1e23"    default="0.00018"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:complexType name="extline_type">
+    <xs:attribute      name="lines"                type="xs:boolean"       default="true"/>
+    <xs:attribute      name="base_point_on_dimension_line"  type="xs:boolean"       default="false"/>
+    <xs:attribute      name="extension_a"          type="non_neg_max_1e23" default="0.0"/>
+    <xs:attribute      name="extension_b"          type="non_neg_max_1e23" default="0.0"/>
+    <xs:attribute      name="offset_c"             type="non_neg_max_1e23" default="0.0"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+  <!-- dimline for geometry -->
+  <xs:complexType name="dimline_type">
+    <xs:sequence>
+      <xs:element name="point"            type="point_type_3d"  minOccurs="2" maxOccurs="unbounded" />
+
+      <xs:element name="position"         type="point_type_3d" />
+      <xs:element name="plane_x"          type="point_type_3d" />
+      <xs:element name="plane_y"          type="point_type_3d" />
+      <xs:element name="dimension_line"   type="dimdimline_type" />
+      <xs:element name="extension_line"   type="extline_type" />
+      <xs:element name="arrow"            type="arrow_type" />
+      <xs:element name="font"             type="font_type" />
+      <xs:element name="text"             type="dimtext_type" minOccurs="0" maxOccurs="unbounded" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required" />
+    <xs:attribute      name="dynamic"     type="xs:boolean"        default="false" />
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- dimarc for geometry -->
+  <xs:complexType name="dimarc_type">
+    <xs:sequence>
+      <xs:element name="arc"              type="fdarc3_type" />
+      <xs:element name="position"         type="point_type_3d" />
+      <xs:element name="dimension_line"   type="dimdimline_type" />
+      <xs:element name="extension_line"   type="extline_type" />
+      <xs:element name="arrow"            type="arrow_type" />
+      <xs:element name="font"             type="font_type" />
+      <xs:element name="text"             type="dimtext_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required" />
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- dimdiam for geometry -->
+  <xs:complexType name="dimdiam_type">
+    <xs:sequence>
+      <xs:element name="arc"              type="fdarc3_type" />
+      <xs:element name="position"         type="point_type_3d" />
+      <xs:element name="dimension_line"   type="dimdimline_type" />
+      <xs:element name="arrow"            type="arrow_type" />
+      <xs:element name="font"             type="font_type" />
+      <xs:element name="text"             type="dimtext_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required" />
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- dimradius for geometry -->
+  <xs:complexType name="dimradius_type">
+    <xs:sequence>
+      <xs:element name="arc"              type="fdarc3_type" />
+      <xs:element name="position"         type="point_type_3d" />
+      <xs:element name="dimension_line"   type="dimdimline_type" />
+      <xs:element name="arrow"            type="arrow_type" />
+      <xs:element name="font"             type="font_type" />
+      <xs:element name="text"             type="dimtext_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required" />
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- dimangle for geometry -->
+  <xs:complexType name="dimangle_type">
+    <xs:sequence>
+      <xs:element name="arc"              type="fdarc3_type" />
+      <xs:element name="base"             type="point_type_3d" />
+      <xs:element name="line1"            type="line_type" />
+      <xs:element name="line2"            type="line_type" />
+      <xs:element name="dimension_line"   type="dimdimline_type" />
+      <xs:element name="extension_line"   type="extline_type" />
+      <xs:element name="arrow"            type="arrow_type" />
+      <xs:element name="font"             type="font_type" />
+      <xs:element name="text"             type="dimtext_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required"/>
+    <xs:attribute      name="beta"        type="xs:double"         use="required"/>
+    <xs:attribute      name="rs1"         type="xs:double"         use="required"/>
+    <xs:attribute      name="re1"         type="xs:double"         use="required"/>
+    <xs:attribute      name="rs2"         type="xs:double"         use="required"/>
+    <xs:attribute      name="re2"         type="xs:double"         use="required"/>
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!-- dimfloor for geometry -->
+  <xs:complexType name="dimfloor_type">
+    <xs:sequence>
+      <xs:element name="position" type="point_type_3d" />
+      <xs:element name="plane_x"  type="point_type_3d" />
+      <xs:element name="plane_y"  type="point_type_3d" />
+      <xs:element name="font"     type="font_type" />
+      <xs:element name="text"     type="dimtext_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"        type="guidtype"          use="required" />
+    <xs:attribute      name="size"        type="positive_max_1e23" use="required" />
+    <xs:attribute      name="layer"       type="layer_name"        default="DIM" />
+    <xs:attribute      name="colour"      type="rgb_color_type"    default="000000"/>
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--layer type-->
+  <xs:complexType name="layer_type">
+    <xs:attribute      name="name"      type="layer_name"     default="0" />
+    <xs:attribute      name="colour"    type="rgb_color_type" default="000000" />
+    <xs:attribute      name="hidden"    type="xs:boolean"     default="false"  />
+    <xs:attribute      name="protected" type="xs:boolean"     default="false"  />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <xs:simpleType name="linetype_data_type">
+    <xs:list itemType="abs_max_1000"/>
+  </xs:simpleType>
+
+  <!--line type type-->
+  <xs:complexType name="linetype_type">
+    <xs:attribute      name="name"      type="xs:string" use="required" />
+    <xs:attribute      name="distances" type="linetype_data_type" use="optional" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+  <!--text type-->
+  <xs:complexType name="text_type">
+    <xs:sequence>
+      <xs:element name="position" type="point_type_3d" />
+      <xs:element name="local_x"  type="point_type_3d" />
+      <xs:element name="local_y"  type="point_type_3d" />
+      <xs:element name="style"    type="style_type" />
+    </xs:sequence>
+    <xs:attribute      name="guid"      type="guidtype"          use="required" />
+    <xs:attribute      name="text"      type="geometry_text1023" use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+  </xs:complexType>
+
+
+<!-- vv========  STEEL JOINT DEFINITIONS - all sizes are in mm and mm2  ==========vv -->
+
+<xs:complexType name="gen_stjoint_type">
+  <xs:sequence>
+    <xs:element name="connection_point" type="point_type_3d" />
+    <xs:element name="connected_items"  type="guidlist_type" />
+    <xs:element name="colouring"        type="entity_color"     minOccurs="0" maxOccurs="1" />   <!-- From FD23 -->
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+    <xs:attribute    name="name"        type="identifier"       use="optional" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:simpleType name="bar_internal_force">
+  <xs:restriction base="xs:double">
+    <xs:minInclusive value="-1E8"/>
+    <xs:maxInclusive value="1E8"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<!-- Bolt types -->
+<xs:complexType name="bolt_length_type">
+    <xs:attribute name="l"           type="positive_max_500"   use="required" />
+    <xs:attribute name="ls"          type="positive_max_500"   use="required" />
+    <xs:attribute name="lg"          type="positive_max_500"   use="required" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="bolt_data_type">
+  <xs:sequence>
+    <xs:element name="bolt_length"   type="bolt_length_type" minOccurs="1" maxOccurs="100" />
+  </xs:sequence>
+    <xs:attribute name="family"           type="name40"             use="required" />
+    <xs:attribute name="d"                type="positive_max_100"   use="required" />
+    <xs:attribute name="pitch"            type="positive_max_100"   use="required" />
+    <xs:attribute name="stress_area"      type="positive_max_10000" use="required" />
+    <xs:attribute name="bolt_b"           type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_c"           type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_ds"          type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_da"          type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_dw"          type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_e"           type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_k"           type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_s"           type="positive_max_100"   use="required" />
+    <xs:attribute name="bolt_r"           type="positive_max_100"   use="required" />
+    <xs:attribute name="nut_m"            type="positive_max_100"   use="required" />
+    <xs:attribute name="nut_e"            type="positive_max_100"   use="required" />
+    <xs:attribute name="nut_s"            type="positive_max_100"   use="required" />
+    <xs:attribute name="washer_thickness" type="positive_max_100"   use="required" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="bolt_lib_type">
+  <xs:sequence>
+    <xs:element name="bolt_data"   type="bolt_data_type" />
+  </xs:sequence>
+  <xs:attributeGroup ref ="lib_base_attribs" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- Component types -->
+<xs:simpleType name="sj_component_values">
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="buckling"/>
+    <xs:enumeration value="endplate"/>
+    <xs:enumeration value="haunch_top"/>
+    <xs:enumeration value="haunch_bottom"/>
+    <xs:enumeration value="stiffener_top"/>
+    <xs:enumeration value="stiffener_bottom"/>
+    <xs:enumeration value="stiffener_diagonal"/>
+    <xs:enumeration value="stiffener_general"/>
+    <xs:enumeration value="stiffener_triangular"/>
+    <xs:enumeration value="fin_plate"/>
+    <xs:enumeration value="splice_web"/>
+    <xs:enumeration value="splice_flange_bottom"/>
+    <xs:enumeration value="splice_flange_top"/>
+    <xs:enumeration value="cover_plate"/>
+    <xs:enumeration value="heel"/>
+    <xs:enumeration value="gusset_plate"/>
+    <xs:enumeration value="champfer_plate"/>
+    <xs:enumeration value="backing_plate"/>
+    <xs:enumeration value="support_plate"/>
+    <xs:enumeration value="concrete"/>
+    <xs:enumeration value="notch"/>
+    <xs:enumeration value="gap"/>
+    <xs:enumeration value="eccentricity"/>
+    <xs:enumeration value="cut"/>
+    <xs:enumeration value="bolts"/>
+    <xs:enumeration value="welds"/>
+    <xs:enumeration value="geometry"/>
+    <xs:enumeration value="endplate_bolts"/>
+    <xs:enumeration value="endplate_welds"/>
+    <xs:enumeration value="endplate_welds_at_beam"/>
+    <xs:enumeration value="endplate_welds_at_column"/>
+    <xs:enumeration value="splice_web_bolts"/>
+    <xs:enumeration value="flange_bolts"/>
+    <xs:enumeration value="splice_web_weld"/>
+    <xs:enumeration value="flange_splice_weld"/>
+    <xs:enumeration value="fin_bolts"/>
+    <xs:enumeration value="fin_welds"/>
+    <xs:enumeration value="heel_welds"/>
+    <xs:enumeration value="cover_welds"/>
+    <xs:enumeration value="support_plate_welds"/>
+    <xs:enumeration value="stiffener_welds"/>
+    <xs:enumeration value="calculation"/>
+    <xs:enumeration value="anchor_geometry"/>
+    <xs:enumeration value="anchor_calculations"/>
+    <xs:enumeration value="calculation_parameters"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:simpleType name="sj_connected_bar_type" >
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="columns_end"/>
+    <xs:enumeration value="column"/>
+    <xs:enumeration value="top_column"/>
+    <xs:enumeration value="bottom_column"/>
+    <xs:enumeration value="beam"/>
+    <xs:enumeration value="beam_1"/>
+    <xs:enumeration value="beam_2"/>
+    <xs:enumeration value="brace_1"/>
+    <xs:enumeration value="brace_2"/>
+    <xs:enumeration value="chord"/>
+    <xs:enumeration value="joint"/>
+    <xs:enumeration value="foundation"/>
+    <xs:enumeration value="anchor-concrete_interaction"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:simpleType name="sj_data_str">
+  <xs:restriction base="xs:string">
+      <xs:pattern value="[\!-\~]{1}[ -\~]{0,49}"/> <!-- at least one non-space char required,  max 49 ASCII char allowed -->
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:simpleType name="sj_datatype_names">
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="buckling_lc_y" />
+    <xs:enumeration value="buckling_lc_z" />
+    <xs:enumeration value="buckling_x_y"  />
+    <xs:enumeration value="buckling_x_z"  />
+    <xs:enumeration value="brace_chord_distance"  />
+    <xs:enumeration value="brace_cut_type"        />
+    <xs:enumeration value="brace_cut_distance"    />
+    <xs:enumeration value="brace_eccentricity"    />
+    <xs:enumeration value="brace_overlapped"      />
+    <xs:enumeration value="brace_overlapped_weld" />
+    <xs:enumeration value="calc_tension_boltrows_for_shear" />
+    <xs:enumeration value="foundation_beta"                 />
+    <xs:enumeration value="foundation_cfd"                  />
+    <xs:enumeration value="foundation_cmin"                 />
+    <xs:enumeration value="foundation_cracked"              />
+    <xs:enumeration value="foundation_ey"                   />
+    <xs:enumeration value="foundation_ez"                   />
+    <xs:enumeration value="foundation_failure_check"        />
+    <xs:enumeration value="foundation_gamma_mc"             />
+    <xs:enumeration value="foundation_gamma_mp"             />
+    <xs:enumeration value="foundation_gamma_msp"            />
+    <xs:enumeration value="foundation_h"                    />
+    <xs:enumeration value="foundation_hmin"                 />
+    <xs:enumeration value="foundation_ignore_cone_failure"  />
+    <xs:enumeration value="foundation_ignore_split_failure" />
+    <xs:enumeration value="foundation_kcr"                  />
+    <xs:enumeration value="foundation_kj"                   />
+    <xs:enumeration value="foundation_kucr"                 />
+    <xs:enumeration value="foundation_l"                    />
+    <xs:enumeration value="foundation_material"             />
+    <xs:enumeration value="foundation_smin"                 />
+    <xs:enumeration value="foundation_u"                    />
+    <xs:enumeration value="foundation_w"                    />
+    <xs:enumeration value="notch_hb" />
+    <xs:enumeration value="notch_ht" />
+    <xs:enumeration value="notch_eb" />
+    <xs:enumeration value="notch_et" />
+    <xs:enumeration value="gap_size" />
+    <xs:enumeration value="plate_apply" />
+    <xs:enumeration value="plate_material" />
+    <xs:enumeration value="plate_tp" />
+    <xs:enumeration value="plate_bp" />
+    <xs:enumeration value="plate_hp" />
+    <xs:enumeration value="plate_length" />
+    <xs:enumeration value="plate_aux_param1" />
+    <xs:enumeration value="plate_aux_param2" />
+    <xs:enumeration value="plate_aux_param3" />
+    <xs:enumeration value="plate_aux_param4" />
+    <xs:enumeration value="plate_aux_param5" />
+    <xs:enumeration value="plate_aux_param6" />
+    <xs:enumeration value="plate_aux_param7" />
+    <xs:enumeration value="plate_aux_param8" />
+    <xs:enumeration value="bolt_type" />
+    <xs:enumeration value="bolt_quality" />
+    <xs:enumeration value="bolt_prestressed" />
+    <xs:enumeration value="bolt_flip" />
+    <xs:enumeration value="bolt_washer_at_nut" />
+    <xs:enumeration value="bolt_washer_at_head" />
+    <xs:enumeration value="anchor_diameter" />
+    <xs:enumeration value="anchor_quality" />
+    <xs:enumeration value="anchor_surface" />
+    <xs:enumeration value="anchor_m" />
+    <xs:enumeration value="anchor_tb" />
+    <xs:enumeration value="anchor_use_max_of_ftrd" />
+    <xs:enumeration value="anchor_ftrd" />
+    <xs:enumeration value="anchor_type" />
+    <xs:enumeration value="anchor_shape" />
+    <xs:enumeration value="anchor_h" />
+    <xs:enumeration value="anchor_lhoriz" />
+    <xs:enumeration value="anchor_rbend" />
+    <xs:enumeration value="anchor_checkadh" />
+    <xs:enumeration value="anchor_dh" />
+    <xs:enumeration value="anchor_cfd" />
+    <xs:enumeration value="bolt_group_ncol" />
+    <xs:enumeration value="bolt_group_nrow" />
+    <xs:enumeration value="bolt_group_c1" />
+    <xs:enumeration value="bolt_group_c2" />
+    <xs:enumeration value="bolt_group_c3" />
+    <xs:enumeration value="bolt_group_c4" />
+    <xs:enumeration value="bolt_group_e0" />
+    <xs:enumeration value="bolt_group_e"  />
+    <xs:enumeration value="bolt_group_e1" />
+    <xs:enumeration value="bolt_group_e2" />
+    <xs:enumeration value="bolt_group_rows" />
+    <xs:enumeration value="weld_type"  />
+    <xs:enumeration value="weld_s"     />
+    <xs:enumeration value="weld_a"     />
+    <xs:enumeration value="weld_afht"  />
+    <xs:enumeration value="weld_awht"  />
+    <xs:enumeration value="weld_af1"   />
+    <xs:enumeration value="weld_aft"   />
+    <xs:enumeration value="weld_aw(l)" />
+    <xs:enumeration value="weld_awr"   />
+    <xs:enumeration value="weld_af(b)" />
+    <xs:enumeration value="weld_af4"   />
+    <xs:enumeration value="weld_awhb"  />
+    <xs:enumeration value="weld_afhb"  />
+    <xs:enumeration value="weld_awh_top" />
+    <xs:enumeration value="weld_awh_bottom" />
+    <xs:enumeration value="weld_af1_back" />
+    <xs:enumeration value="weld_aft_back" />
+    <xs:enumeration value="weld_afw_back" />
+    <xs:enumeration value="weld_afb_back" />
+    <xs:enumeration value="weld_af4_back" />
+    <xs:enumeration value="weld_length" />
+    <xs:enumeration value="weld_edges" />
+    <xs:enumeration value="weld_buttering" />
+    <xs:enumeration value="weld_preheating" />
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:complexType name="sj_data_type">
+    <xs:attribute name="type"           type="sj_datatype_names"     use="required" />
+    <xs:attribute name="value"          type="sj_data_str"           use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="sj_boltline_type">
+    <xs:attribute name="distance"       type="sj_data_str"           use="required" />
+    <xs:attribute name="from"           type="sj_data_str"           use="required" />
+    <xs:attribute name="bolts"          type="sj_data_str"           use="required" />
+    <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="sj_component_type">
+  <xs:sequence>
+    <xs:element name="record" >
+      <xs:complexType>
+         <xs:sequence>
+           <xs:element name="property"      type="sj_data_type"      minOccurs="1"  maxOccurs="17" />
+         </xs:sequence>
+      </xs:complexType>
+    </xs:element>
+    <xs:element name="bolt_rows"                                     minOccurs="0"  maxOccurs="1" ><!-- ONLY FOR end_plate_bolts COMPONENT! -->
+      <xs:complexType>
+         <xs:sequence>
+           <xs:element name="row" type="sj_boltline_type"            minOccurs="1"  maxOccurs="unbounded" />
+         </xs:sequence>
+      </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+  <xs:attribute name="type"                 type="sj_component_values"   use="required"/>
+  <xs:attribute name="connected_to"             type="sj_connected_bar_type" use="required"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="sj_topology_type">
+  <xs:sequence>
+    <xs:element name="component"        type="sj_component_type"     minOccurs="1"  maxOccurs="16" />
+  </xs:sequence>
+</xs:complexType>
+
+<xs:complexType name="sj_force_type">
+  <xs:attribute name="n"                type="bar_internal_force"    default="0.0" />
+  <xs:attribute name="t_y"              type="bar_internal_force"    default="0.0" />
+  <xs:attribute name="t_z"              type="bar_internal_force"    default="0.0" />
+  <xs:attribute name="m_x"              type="bar_internal_force"    default="0.0" />
+  <xs:attribute name="m_y"              type="bar_internal_force"    default="0.0" />
+  <xs:attribute name="m_z"              type="bar_internal_force"    default="0.0" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="sj_1bar_connection_type">
+  <xs:sequence>
+    <xs:element name="bar1"                          type="guid_list_type" />
+    <xs:element name="load_combination"                                         minOccurs="0"  maxOccurs="unbounded">
+      <xs:complexType>
+        <xs:sequence>
+          <xs:element name="bar1_forces"             type="sj_force_type" />
+        </xs:sequence>
+        <xs:attribute name="guid"                    type="guidtype"            use="required" />
+        <xs:attribute name="_2nd_order_calculation"  type="xs:boolean"          default="false" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+</xs:complexType>
+
+<xs:complexType name="sj_2bars_connection_type">
+  <xs:sequence>
+    <xs:element name="bar1"                          type="guid_list_type" />
+    <xs:element name="bar2"                          type="guid_list_type" />
+    <xs:element name="load_combination"                                         minOccurs="0"  maxOccurs="unbounded">
+      <xs:complexType>
+        <xs:sequence>
+          <xs:element name="bar1_forces"             type="sj_force_type" />
+          <xs:element name="bar2_forces"             type="sj_force_type" />
+        </xs:sequence>
+        <xs:attribute name="guid"                    type="guidtype"            use="required" />
+        <xs:attribute name="_2nd_order_calculation"  type="xs:boolean"          default="false" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+</xs:complexType>
+
+<xs:complexType name="sj_3bars_connection_type">
+  <xs:sequence>
+    <xs:element name="bar1"                          type="guid_list_type" />
+    <xs:element name="bar2"                          type="guid_list_type" />
+    <xs:element name="bar3"                          type="guid_list_type" />
+    <xs:element name="load_combination"                                         minOccurs="0"  maxOccurs="unbounded">
+      <xs:complexType>
+        <xs:sequence>
+          <xs:element name="bar1_forces"             type="sj_force_type" />
+          <xs:element name="bar2_forces"             type="sj_force_type" />
+          <xs:element name="bar3_forces"             type="sj_force_type" />
+        </xs:sequence>
+        <xs:attribute name="guid"                    type="guidtype"            use="required" />
+        <xs:attribute name="_2nd_order_calculation"  type="xs:boolean"          default="false" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+</xs:complexType>
+
+<xs:complexType name="steel_joint_type">
+  <xs:sequence>
+    <xs:choice> <!--one of the following elements is required-->
+      <!-- choice: COLUM SPLICEs -->
+      <xs:element name="column_splice_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_splice_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_splice_solution3">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_splice_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_splice_solution5">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"           type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_splice_solution6">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"           type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice: BEAM SPLICEs -->
+      <xs:element name="beam_splice_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"           type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution3">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution5">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution6">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_splice_solution7">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice: COLUMN BASEs -->
+      <xs:element name="column_base_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_1bar_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="column_base_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_1bar_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice: BEAM TO BEAMs -->
+      <xs:element name="beam_to_beam_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_beam_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_beam_solution3">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_beam_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_beam_solution5">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice: BEAM TO COLUMNs -->
+      <xs:element name="beam_to_column_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution3">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution5a">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution5b">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution6">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution7">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="beam_to_column_solution8">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice: KNEEs -->
+      <xs:element name="knee_solution1">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution2">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution3">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution5a">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution5b">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution6a">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution6b">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution7">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="knee_solution8">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution1y">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution1x">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution1k">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution2y">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution2x">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution2k">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution3y">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_2bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution3x">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution3k">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution4">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution5">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- next choice-->
+      <xs:element name="bracing_solution6">
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="connecting_bars"       type="sj_3bars_connection_type" />
+          </xs:sequence>
+        </xs:complexType>
+      </xs:element>
+      <!-- end of choices -->
+    </xs:choice>
+
+    <xs:element name="topology"                      type="sj_topology_type"  minOccurs="0"  maxOccurs="1" />
+    <xs:element name="colouring"                     type="entity_color"      minOccurs="0" maxOccurs="1" />  <!-- From FD23 -->
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="name"                     type="identifier"        default="SJ" />
+  <xs:attribute      name="version"                  type="xs:int"            default="1"  />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- ==  Corbels  ====================================================================== -->
+<xs:complexType name="column_corbel_type"> <!-- From FD18 -->
+  <xs:sequence>
+    <xs:element name="connectable_parts"  type="three_guid_list_type" minOccurs="0" maxOccurs="1" /> <!-- Required from FD18.00.003! -->
+    <xs:element name="connectivity"       type="connectivity_type" />
+    <xs:any minOccurs="0" maxOccurs="unbounded" />
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="name"                type="identifier"      default=""       /> <!-- empty names generates "CO" in FD -->
+  <xs:attribute      name="base_column"         type="guidtype"        use="required"   />
+  <xs:attribute      name="complex_material"    type="guidtype"        use="required"   />
+  <xs:attribute      name="made"                type="steelmadetype"   default="rolled" />
+  <xs:attribute      name="complex_section"     type="guidtype"        use="required"   />
+
+  <xs:attribute      name="pos"                 type="position_type"   use="required"   />
+  <xs:attribute      name="alpha"               type="quadrant"        use="required"   />
+  <xs:attribute      name="d"                   type="non_neg_max_10"  use="optional"   /> <!-- if it not given, FD uses automatic adjusting -->
+  <xs:attribute      name="l"                   type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="e"                   type="abs_max_10"      use="required"   />
+  <xs:attribute      name="x"                   type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="y"                   type="abs_max_10"      use="required"   />
+  <xs:attribute      name="stage"               type="stage_number"    default="1"      />      <!-- From FD21.00.003 -->
+  <xs:attribute      name="end_stage"           type="stage_data"      default="last_stage" />  <!-- From FD22 -->
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="wall_corbel_type"> <!-- From FD18 -->
+  <xs:sequence>
+    <xs:element      name="start_point"         type="point_type_3d" />
+    <xs:element      name="end_point"           type="point_type_3d" />
+    <xs:element      name="connectable_parts"   type="two_guid_list_type" minOccurs="0" maxOccurs="1" /> <!-- Required from FD18.00.003! -->
+    <xs:choice>
+      <xs:element    name="rigidity"            type="rigidity_data_type3"/>
+      <xs:element    name="predefined_rigidity" type="reference_type"/>
+      <!-- new choice from FD20 -->
+      <xs:element   name="rigidity_group"       type="rigidity_group_type3"/>
+    </xs:choice>
+    <xs:any minOccurs="0" maxOccurs="unbounded" />
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="name"                type="identifier"      default=""       /> <!-- empty names generates "CW" in FD -->
+  <xs:attribute      name="positive_side"       type="xs:boolean"      default="true"   />
+  <xs:attribute      name="l"                   type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="h1"                  type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="h2"                  type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="x"                   type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="base_wall"           type="guidtype"        use="required"   />
+  <xs:attribute      name="complex_material"    type="guidtype"        use="required"   />
+  <xs:attribute      name="stage"               type="stage_number"    default="1"      />      <!-- From FD21.00.003 -->
+  <xs:attribute      name="end_stage"           type="stage_data"      default="last_stage" />  <!-- From FD22 -->
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- ==  stbar_haunch_type  ====================================================== -->
+
+<xs:complexType name="stbar_haunch_type"> <!-- From FD20.00.002 -->
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="base_bar"            type="guidtype"        use="required"   />
+  <xs:attribute      name="at_start"            type="xs:boolean"      use="required"   />
+  <xs:attribute      name="at_top"              type="xs:boolean"      use="required"   />
+  <xs:attribute      name="d"                   type="non_neg_max_10"  use="required"   />
+  <xs:attribute      name="l"                   type="positive_max_10" use="required"   />
+  <xs:attribute      name="h"                   type="positive_max_10" use="required"   />
+  <xs:attribute      name="tw"                  type="positive_max_10" use="required"   />
+  <xs:attribute      name="tf"                  type="from_1e-4_to_10" use="required"   />
+  <xs:attribute      name="bf"                  type="positive_max_10" use="required"   />
+
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- ==  stbar_siffener_type  ====================================================== -->
+<xs:complexType name="stbar_siffener_type"> <!-- From FD20.00.002 -->
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="base_bar"            type="guidtype"        use="required"   />
+  <xs:attribute      name="pos"                 type="position_type"   use="required"   />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- ==  Covers  ==================================================================== -->
+<xs:simpleType name="roof_type">
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="flat"   />
+    <xs:enumeration value="lean-to"/>
+    <xs:enumeration value="ridge"  />
+  </xs:restriction>
+</xs:simpleType>
+
+<!-- cover reference list -->
+<xs:complexType name="cover_referencelist_type" >
+  <xs:sequence>
+    <xs:element name="ref" minOccurs="1" maxOccurs="unbounded" >
+        <xs:complexType>
+          <xs:sequence>
+            <xs:element name="edge" type="edge_type" minOccurs="0" maxOccurs="unbounded" /> <!-- but ONLY LINEs allowed and mandatory if the referred entity has region! -->
+          </xs:sequence>
+          <xs:attribute name="guid" type="guidtype"  use="required" />
+          <xs:anyAttribute   processContents="skip"/>
+        </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+
+<xs:complexType name="cover_type"> <!-- From FD18 -->
+  <xs:sequence>
+    <xs:element      name="load_bearing_direction" type="point_type_3d"            minOccurs="0" maxOccurs="1"/>  <!-- valid normal or nullvector if not defined -->
+    <xs:element      name="region"                 type="region_type"   />
+    <xs:element      name="supporting_structures"  type="cover_referencelist_type" minOccurs="0" maxOccurs="1" /> <!-- From FD19, FD18 used simple referencelist_type -->
+    <xs:element      name="colouring"              type="entity_color"             minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="name"                   type="identifier"         default="" />           <!-- empty names generates "C0" in FD -->
+  <xs:attribute      name="stage"                  type="stage_number"       default="1" />          <!-- From FD21.00.003 -->
+  <xs:attribute      name="end_stage"              type="stage_data"         default="last_stage" /> <!-- From FD22 -->
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="coverlist_type"> <!-- From FD20.00.002 -->
+  <xs:sequence>
+    <xs:element      name="cover"                                             minOccurs="5" maxOccurs="6" > <!-- 6 for ridge roofs, 5 for others -->
+      <xs:complexType>
+        <xs:attribute      name="guid"              type="guidtype"           use="required" />
+        <xs:anyAttribute   processContents="skip"/>
+      </xs:complexType>
+    </xs:element>
+  </xs:sequence>
+</xs:complexType>
+
+<xs:complexType name="building_cover_type"> <!-- From FD18 -->
+  <xs:sequence>
+    <xs:element      name="base_rectangle"         type="rectangle_type"   />
+    <xs:element      name="supporting_structures"  type="referencelist_type"  minOccurs="0" maxOccurs="1" />
+    <xs:element      name="covers"                 type="coverlist_type"      minOccurs="0" maxOccurs="1" /> <!-- From FD20.00.002 and mandatory from now on! Order: Front, Back, Left, Right, Top (front), Top back -->
+    <xs:element      name="colouring"              type="entity_color"        minOccurs="0" maxOccurs="1" /> <!-- From FD23 -->
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="name"                   type="identifier"          default=""    /> <!-- empty names generates "CO" in FD -->
+  <xs:attribute      name="roof_type"              type="roof_type"           default="flat"/>
+  <xs:attribute      name="h_wall"                 type="positive_max_10000"  default="6.0" />
+  <xs:attribute      name="h_roof"                 type="non_neg_max_10000"   default="1.0" />
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+
+<xs:simpleType name="viewtype">
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="2d"/>
+    <xs:enumeration value="3d"/>
+    <xs:enumeration value="storey"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:simpleType name="displaymodes">
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="wireframe"/>
+    <xs:enumeration value="hidden_line"/>
+    <xs:enumeration value="shade"/>
+    <xs:enumeration value="shade_with_edges"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:complexType name="userfilter_type"> <!-- From FD21 -->
+  <xs:sequence>
+    <xs:element      name="members"                type="guidlist_type"   />
+  </xs:sequence>
+  <xs:attribute      name="name"                   type="name15"               use="required"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="view_type"> <!-- From FD21 -->
+  <xs:sequence>
+    <xs:element      name="coordinate_system_2d"   type="untested_localsys_type" />
+    <xs:element      name="coordinate_system_3d"   type="untested_localsys_type" />
+    <xs:element      name="user_coordinate_system" type="untested_localsys_type" />
+  </xs:sequence>
+  <xs:attribute      name="name"                   type="name255"              use="required"/>
+  <xs:attribute      name="scale"                  type="material_0base_value" use="required"/>
+  <xs:attribute      name="tolerance"              type="material_0base_value" use="required"/>
+  <xs:attribute      name="type"                   type="viewtype"             use="required"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- Construction Stages elements -->
+<xs:simpleType name="cs_part_type">  <!-- From FD21.00.003 -->
+  <xs:restriction base="xs:string">
+    <xs:enumeration value="only_in_this_stage"/>
+    <xs:enumeration value="from_this_stage_on"/>
+    <xs:enumeration value="shifted_from_first_stage"/>
+    <xs:enumeration value="only_stage_activated_elem"/>
+  </xs:restriction>
+</xs:simpleType>
+
+<xs:complexType name="sfactor_type">   <!-- From FD22 -->
+  <xs:attribute      name="Sc"                              type="abs_max_1e20"         use="required"/>
+  <xs:attribute      name="Sf"                              type="abs_max_1e20"         use="required"/>
+  <xs:attribute      name="Sq"                              type="abs_max_1e20"         use="required"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="cs_lc_type">   <!-- From FD21.00.003 -->
+  <xs:sequence>
+    <xs:element      name="s_factors"                           type="sfactor_type"         minOccurs="0" maxOccurs="1" /> <!-- From FD22 -->
+  </xs:sequence>
+  <xs:attribute      name="case"                                type="load_case_cs_pe"      use="required"/>
+  <xs:attribute      name="factor"                              type="abs_max_1e20"         use="required"/> <!-- From FD22 it means 'U' factor -->
+  <xs:attribute      name="partitioning"                        type="cs_part_type"         use="required"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="cs_stage_type"> <!-- From FD21.00.003 -->
+  <xs:sequence>
+    <xs:element      name="activated_load_case"                 type="cs_lc_type"           minOccurs="0" maxOccurs="unbounded" />
+  </xs:sequence>
+  <xs:attribute      name="description"                         type="name79"               use="required"/>
+  <xs:attribute      name="initial_stress_state"                type="xs:boolean"           default="false"/>
+  <xs:attribute      name="day"                                 type="non_neg_max_1e20"     default="+0.0"/> <!-- From FD22 -->
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="cs_type"> <!-- From FD21.00.003 -->
+  <xs:sequence>
+    <xs:element      name="stage"                               type="cs_stage_type"        minOccurs="2" maxOccurs="32768" />
+  </xs:sequence>
+  <xs:attribute      name="auto-assign_modified_elements"       type="xs:boolean"           default="false"/>
+  <xs:attribute      name="auto-assign_newly_created_elements"  type="xs:boolean"           default="false"/>
+  <xs:attribute      name="ghost_method"                        type="xs:boolean"           default="false"/>
+  <xs:attribute      name="time-dependent_analysis"             type="xs:boolean"           default="false"/>
+  <xs:attribute      name="creep_strain_increment_limit"        type="thousand_percent"     default="0.25"/> <!-- From FD22 -->
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<xs:complexType name="psr_type"> <!-- From FD21.00.006 -->
+  <xs:sequence>
+    <xs:element      name="contour"                type="contour_type"   />
+  </xs:sequence>
+  <xs:attributeGroup ref="entity_attribs" />
+  <xs:attribute      name="inactive"               type="xs:boolean"          default="false"/>
+  <xs:anyAttribute   processContents="skip"/>
+</xs:complexType>
+
+<!-- ##  Real data structure ########################################################## -->
+  <!--root database-->
+  <xs:element name="database">
+    <xs:complexType>
+      <xs:sequence>
+
+        <!--========  Construction Stages  ======-->
+        <xs:element name="construction_stages"  type="cs_type"                                       minOccurs="0" maxOccurs="1" />         <!-- From FD21.00.003 -->
+
+        <xs:element name="entities" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <!-- foundations & soil -->
+              <xs:element name="foundations"    type="foundation_type"                               minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="soil_elements"                                                       minOccurs="0" maxOccurs="1" >          <!-- From FD20 -->
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="strata"      type="strata_type"   />
+                      <!-- only non-default borehole data required: -->
+                    <xs:element name="borehole"    type="borehole_type"                              minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="filling"     type="filling_type"                               minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="excavation"  type="excavation_type"                            minOccurs="0" maxOccurs="unbounded" /> <!-- From FD 22 -->
+                    <xs:element name="pile"        type="pile_type"                                  minOccurs="0" maxOccurs="unbounded" />
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+              <xs:element name="retaining_wall"    type="retaining_wall_type"                        minOccurs="0" maxOccurs="unbounded" /> <!-- From FD 22 -->
+
+              <!--general beam: beams, coloumns and trusses -->
+              <xs:element name="bar"                              type="bar_type"                    minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="column_corbel"                    type="column_corbel_type"          minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+              <xs:element name="steel_bar_haunch"                 type="stbar_haunch_type"           minOccurs="0" maxOccurs="unbounded" /> <!-- From FD21, for non-shell model bars, but not for trusses  -->
+              <xs:element name="steel_bar_stiffener"              type="stbar_siffener_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20.00.002 -->
+              <xs:element name="rc_beam_reduction_zone"           type="beam_reduction_zone_type"    minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+              <xs:element name="hidden_bar"                       type="hidden_bar_type"             minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+              <xs:element name="bar_reinforcement"                type="bar_rf_type"                 minOccurs="0" maxOccurs="unbounded" /> <!-- From FD14 -->
+
+              <!--slabs: walls and plates -->
+              <xs:element name="slab"                                      type="slab_type"                   minOccurs="0" maxOccurs="unbounded" />
+              <!-- Important: The shell bucklings should be grouped according to their base shell: do not mix those who do not belong to the same shell! -->
+              <xs:element name="shell_buckling"                            type="shell_buckling_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+              <xs:element name="wall_corbel"                               type="wall_corbel_type"            minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+              <xs:element name="surface_reinforcement_parameters"          type="shell_rf_params_type"        minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="surface_reinforcement"                     type="surface_rf_type"             minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="surface_reinforcement_single_by_line"      type="surface_rf_line_type"        minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+              <xs:element name="surface_reinforcement_single_by_rectangle" type="surface_rf_rect_type"        minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+              <xs:element name="punching_area"                             type="punching_area_type"          minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="punching_area_wall"                        type="punching_area_wall_type"     minOccurs="0" maxOccurs="unbounded" /> <!-- From FD21 -->
+              <xs:element name="punching_reinforcement"                    type="punching_reinforcement_type" minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="no-shear_region"                           type="noshear_region_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD19 -->
+              <xs:element name="shear_control_region"                      type="shear_control_region_type"   minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+              <xs:element name="surface_shear_reinforcement"               type="surface_shear_rf_type"       minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+
+              <!--panels -->
+              <xs:element name="panel"                            type="panel_type"                  minOccurs="0" maxOccurs="unbounded" />
+
+              <!-- ptc -->
+              <xs:element name="post-tensioned_cable"             type="ptc_type"                    minOccurs="0" maxOccurs="unbounded" />
+
+              <!--loads-->
+              <xs:element name="loads" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <!-- Force loads-->
+                    <xs:element name="point_load"                         type="point_load_type"               minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="line_load"                          type="line_load_type"                minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="pressure_load"                      type="pressure_load_type"            minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="surface_load"                       type="surface_load_type"             minOccurs="0" maxOccurs="unbounded" />
+                    <!-- Temperature variation loads -->
+                    <xs:element name="line_temperature_variation_load"    type="line_temperature_load_type"    minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="surface_temperature_variation_load" type="surface_temperature_load_type" minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <!-- Stress loads -->
+                    <xs:element name="line_stress_load"                   type="line_stress_load_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="surface_stress_load"                type="surface_stress_load_type"      minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <!-- Support motion loads -->
+                    <xs:element name="point_support_motion_load"          type="point_support_load_type"       minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="line_support_motion_load"           type="line_support_load_type"        minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="surface_support_motion_load"        type="surface_support_load_type"     minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <!-- Dynamic loads -->
+                    <xs:element name="mass"                               type="mass_point_type"               minOccurs="0" maxOccurs="unbounded" /> <!-- From FD19 -->
+                    <xs:element name="load_case_mass_conversion_table"    type="mass_conversion_type"          minOccurs="0" maxOccurs="1" />         <!-- From FD19 -->
+                    <xs:element name="seismic_load"                       type="seismic_load_type"             minOccurs="0" maxOccurs="1" />         <!-- From FD19 -->
+                    <xs:element name="footfall_analysis_data"             type="footfall_type"                 minOccurs="0" maxOccurs="unbounded" /> <!-- From FD19 -->
+                    <xs:element name="ground_acceleration"                type="ground_acceleration_type"      minOccurs="0" maxOccurs="1" />         <!-- From FD20-->
+                    <xs:element name="excitation_force"                   type="excitation_force_type"         minOccurs="0" maxOccurs="1" />         <!-- From FD20 -->
+                    <xs:element name="periodic_excitation"                type="periodic_excitation_type"      minOccurs="0" maxOccurs="1" />         <!-- From FD21.00.006 -->
+                    <xs:element name="moving_load"                        type="moving_load_type"              minOccurs="0" maxOccurs="unbounded" /> <!-- From FD19 -->
+                    <!-- load container types -->
+                    <xs:element name="load_case"                          type="load_case_type"                minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="load_combination"                   type="load_combination_type"         minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="load_group_table"                   type="load_group_table"              minOccurs="0" maxOccurs="1" />         <!-- From FD18 -->
+                    <!-- wind load panel types  -->
+                    <xs:element name="wind_loads_external_wall"           type="wl_external_wall_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20.00.002 -->
+                    <xs:element name="wind_loads_flat_roof"               type="wl_flat_roof_type"             minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20.00.002 -->
+                    <xs:element name="wind_loads_lean-to"                 type="wl_leanto_type"                minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20.00.002 -->
+                    <xs:element name="wind_loads_ridge_roof"              type="wl_ridge_roof_type"            minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20.00.002 -->
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--supports-->
+              <xs:element name="supports" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="point_support"       type="point_support_type"       minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="line_support"        type="line_support_type"        minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="surface_support"     type="surface_support_type"     minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="stiffness_point"     type="stiffness_point_type"     minOccurs="0" maxOccurs="unbounded" /> <!-- From FD20 -->
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--connections and virtual objects-->
+              <xs:element name="advanced-fem" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="connected_points"     type="connected_points_type"    minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="connected_lines"      type="connected_lines_type"     minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="surface_connection"   type="surface_connection_type"  minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="virtual_bar"          type="virtual_bar_type"         minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="virtual_shell"        type="virtual_shell_type"       minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="diaphragm"            type="diaphragm_type"           minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="steel_joint"          type="steel_joint_type"         minOccurs="0" maxOccurs="unbounded" />
+                    <xs:element name="general_steel_joint"  type="gen_stjoint_type"         minOccurs="0" maxOccurs="unbounded" /> <!-- From FD22 -->
+                    <xs:element name="cover"                type="cover_type"               minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                    <xs:element name="building_cover"       type="building_cover_type"      minOccurs="0" maxOccurs="unbounded" /> <!-- From FD18 -->
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--Storeys-->
+              <xs:element name="storeys" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="storey"               type="storey_type"              minOccurs="1" maxOccurs="unbounded" />
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--Axes-->
+              <xs:element name="axes" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="axis"                 type="axis_type"                minOccurs="1" maxOccurs="1024"/>
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!-- Reference planes - from FD17 -->
+              <xs:element name="reference_planes" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="reference_plane"      type="refplane_type"            minOccurs="1" maxOccurs="unbounded"/>
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!-- Labelled section's geometry - from FD19.00.004 -->
+              <xs:element name="labelled_sections_geometry" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="section_geometry"         type="labsecgeom_type"          minOccurs="1" maxOccurs="unbounded"/>
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!-- Result points - from FD22 -->
+              <xs:element name="result_points" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="result_point"             type="respoint_type"            minOccurs="1" maxOccurs="unbounded"/>
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--TSolids (stand-alone ones only) -->
+              <xs:element name="tsolids" minOccurs="0" maxOccurs="1">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="polyhedron"                       type="polyhedron_type"                  minOccurs="1" maxOccurs="unbounded"/>
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!-- Peak smoothing regions, From FD21.00.006 -->
+              <xs:element name="peak_smoothing_region" type="psr_type" minOccurs="0" maxOccurs="unbounded" />
+
+              <!--Regions - only for schema compatibility, DO NOT USE! -->
+              <xs:element name="regions" minOccurs="0">
+                <xs:complexType>
+                  <xs:sequence>
+                    <xs:element name="region"                           type="drawing_region_type"              minOccurs="1" maxOccurs="unbounded" />
+                  </xs:sequence>
+                </xs:complexType>
+              </xs:element>
+
+              <!--removed entities
+              <xs:element name="removed" type="removed_type" minOccurs="0" maxOccurs="unbounded" /> -->
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <!--===========  used library items  ==================================================================-->
+        <!--sections-->
+        <xs:element name="sections" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="section"         type="section_type"         minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="complex_section" type="complex_section_type" minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element> <!-- end of entities -->
+
+        <!--materials-->
+        <xs:element name="materials" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="material"         type="material_type"         minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="complex_material" type="complex_material_type" minOccurs="0" maxOccurs="unbounded" /> <!-- NOT IMPLEMENTED YET! -->
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+         <!-- rc materials-->
+        <xs:element name="reinforcing_materials" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="material" type="rfmaterial_type"               minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+         <!-- composites, from FD 17.000.02 -->
+        <xs:element name="composites" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="composite_section" type="composite_data" minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="complex_composite" type="complex_composite_type" minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+         <!-- Connection types, from FD18 -->
+        <xs:element name="point_connection_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type2"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="point_support_group_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type2"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="line_connection_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type3"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="line_support_group_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type2"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="surface_connection_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type1"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="surface_support_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="rigidity_datalib_type1"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="timber_panel_types" minOccurs="0"> <!-- Orthotropic panels only -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="timberpanel_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="glc_panel_types" minOccurs="0"> <!-- From FD19 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="glcpanel_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="clt_panel_types" minOccurs="0"> <!-- From FD19 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="cltpanel_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="ptc_strand_types" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="ptc_strand_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="vehicle_types" minOccurs="0"> <!-- From FD19 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="vehicle_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <xs:element name="bolt_types" minOccurs="0"> <!-- From FD19 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="predefined_type" type="bolt_lib_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+
+        <!--========  Standard CAD geometry elements  ===================================-->
+        <xs:element name="geometry" minOccurs="0" maxOccurs="1"> <!-- From FD21 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="curve"              type="curve_type"           minOccurs="0" maxOccurs="unbounded" /> <!-- It is a non-upgradeable item! -->
+              <xs:element name="point"              type="point_type"           minOccurs="0" maxOccurs="unbounded" /> <!-- It is a non-upgradeable item! -->
+              <xs:element name="region"             type="drawing_region_type"  minOccurs="0" maxOccurs="unbounded" /> <!-- It is a non-upgradeable item! -->
+              <xs:element name="solid"              type="solid_type"           minOccurs="0" maxOccurs="unbounded" /> <!-- It is a non-upgradeable item! -->
+              <xs:element name="text"               type="text_type"            minOccurs="0" maxOccurs="unbounded" /> <!-- It is a non-upgradeable item! -->
+
+              <xs:element name="linear_dimension"   type="dimline_type"         minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="arc_dimension"      type="dimarc_type"          minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="diameter_dimension" type="dimdiam_type"         minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="radius_dimension"   type="dimradius_type"       minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="angle_dimension"    type="dimangle_type"        minOccurs="0" maxOccurs="unbounded" /> <!-- Works only with items made after FD21! -->
+              <xs:element name="level_dimension"    type="dimfloor_type"        minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="line_type"          type="linetype_type"        minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="layer"              type="layer_type"           minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <!--======== User defined lfilters  ================-->
+        <xs:element name="user_defined_filter"      type="userfilter_type"      minOccurs="0" maxOccurs="unbounded" /> <!-- From FD21 -->
+
+        <!--======== User defined views  ================-->
+        <xs:element name="user_defined_views"                                   minOccurs="0" maxOccurs="1" > <!-- From FD21 -->
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="view"               type="view_type"            minOccurs="1" maxOccurs="128" /> <!-- It is a non-upgradeable item! -->
+            </xs:sequence>
+            <xs:attribute name="actual_view"        type="name255"              use="optional"/>
+            <xs:attribute name="physical_view"      type="xs:boolean"           default="false"/>
+            <xs:attribute name="display_mode"       type="displaymodes"         default="wireframe"/>
+            <xs:anyAttribute   processContents="skip"/>
+          </xs:complexType>
+        </xs:element>
+
+        <!--=== Remote automation types. NOT IMPLEMENTED YET! - ->
+        <!- -request for server solver- ->
+        <xs:element name="request" type="request_type" minOccurs="0" maxOccurs="unbounded" />
+        <xs:element name="answer"  type="answer_type"  minOccurs="0" maxOccurs="unbounded" />
+
+        <!- -commands for scripting the solvers- ->
+        <xs:element name="commands" type="command_type" minOccurs="0" />
+
+        <!- -result of the solutions- ->
+        <xs:element name="result" type="result_type" minOccurs="0" />
+
+        <!- -log system: "debug" and "message" for the developer, internal use. Debug works only in DEBUG mode.
+        "warning" will appear on a message box, "error" is fatal error, so the database cannot be loaded. - ->
+        <xs:element name="log" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="error"   type="log_type"  minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="warning" type="log_type"  minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="message" type="log_type"  minOccurs="0" maxOccurs="unbounded" />
+              <xs:element name="debug"   type="log_type"  minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+
+        <!- -file names of the modell. It is not necessary to fill - ->
+        <xs:element name="filenames" minOccurs="0">
+          <xs:complexType>
+            <xs:sequence>
+              <xs:element name="file" type="filename_type" minOccurs="0" maxOccurs="unbounded" />
+            </xs:sequence>
+          </xs:complexType>
+        </xs:element>
+        -->
+
+        <xs:element name="end" type="empty_type" />
+
+        <xs:any minOccurs="0" maxOccurs="unbounded" />
+      </xs:sequence>
+      <!--==== The header attributes ========================================================================-->
+      <!-- The actual struXML version;  should be equal to the schema version the xml file is conformed to -->
+      <xs:attribute name="struxml_version" type="versiontype" use="required" />
+      <!--source software: name of the StruSoft or 3rd party product what generated this XML file-->
+      <xs:attribute name="source_software" type="xs:string" use="required" />
+      <!--start_time: the data is partial data, so the oldest entity latest modification date and time is the
+      value in UTC. If the current XML contains the whole database, the start_time value is
+      "1970-01-01T00:00:00Z". The date and time always in UTC!-->
+      <xs:attribute name="start_time"      type="xs:dateTime" use="required" />
+      <!--the data is partial data, so the newest entity latest modification date and time is this
+      value in UTC. This date and time always in UTC!-->
+      <xs:attribute name="end_time"        type="xs:dateTime" use="required" />
+      <!--The GUID of the whole database. It is always checked before the update process.-->
+      <xs:attribute name="guid"            type="guidtype" use="required" />
+      <!--SHA1 hash on sorted GUIDs-->
+      <!--http://en.wikipedia.org/wiki/SHA-1-->
+      <xs:attribute name="soil_as_solid"   type="xs:boolean" default="false"/>
+      <xs:attribute name="hash"            type="hashtype" />                         <!-- not used actually -->
+      <!--convert id for Revit connection-->
+      <xs:attribute name="convertid"       type="guidtype" default="00000000-0000-0000-0000-000000000000" /> <!-- not used actually -->
+      <!--used standard in database-->
+      <xs:attribute name="standard"        type="standardtype" default="EC" />
+      <xs:attribute name="country"         type="eurocodetype" default="common" />
+      <xs:anyAttribute   processContents="skip"/>
+    </xs:complexType>
+  </xs:element>
+
+</xs:schema>