XMLFragmenter/XMLXQuery*: only get root elements

Hi there,

I don’t see the forest for the trees 🤔

Input data

XML excerpt (source https://ifc43-docs.standards.buildingsmart.org/IFC/RELEASE/IFC4x3/HTML/annex-a-xsd.html):

<?xml version='1.0' encoding='ASCII'?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ifc="https://standards.buildingsmart.org/IFC/RELEASE/IFC4/3/DEV/9d19c824" targetNamespace="https://standards.buildingsmart.org/IFC/RELEASE/IFC4/3/DEV/9d19c824" elementFormDefault="qualified" attributeFormDefault="unqualified">
 <xs:element name="uos" type="ifc:uos" abstract="true"/>
 <xs:simpleType name="Seq-anyURI">
  <xs:list itemType="xs:anyURI"/>
 </xs:simpleType>
 <xs:complexType name="uos" abstract="true">
  <xs:sequence>
   <xs:element name="header" minOccurs="0">
    <xs:complexType>
     <xs:sequence>
      <xs:element name="name" type="xs:string" minOccurs="0"/>
      <xs:element name="time_stamp" type="xs:dateTime" minOccurs="0"/>
      <xs:element name="author" type="xs:string" minOccurs="0"/>
      <xs:element name="organization" type="xs:string" minOccurs="0"/>
      <xs:element name="preprocessor_version" type="xs:string" minOccurs="0"/>
      <xs:element name="originating_system" type="xs:string" minOccurs="0"/>
      <xs:element name="authorization" type="xs:string" minOccurs="0"/>
      <xs:element name="documentation" type="xs:string" minOccurs="0"/>
     </xs:sequence>
    </xs:complexType>
   </xs:element>
  </xs:sequence>
  <xs:attribute name="id" type="xs:ID" use="optional"/>
  <xs:attribute name="express" type="ifc:Seq-anyURI" use="optional"/>
  <xs:attribute name="configuration" type="ifc:Seq-anyURI" use="optional"/>
 </xs:complexType>
 <xs:element name="ifcXML" type="ifc:ifcXML" substitutionGroup="ifc:uos"/>
 <xs:complexType name="ifcXML">
  <xs:complexContent>
   <xs:extension base="ifc:uos">
    <xs:choice minOccurs="0" maxOccurs="unbounded">
     <xs:element ref="ifc:Entity"/>
    </xs:choice>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
 <xs:element name="IfcActionRequest" type="ifc:IfcActionRequest" substitutionGroup="ifc:IfcControl" nillable="true"/>
 <xs:complexType name="IfcActionRequest">
  <xs:complexContent>
   <xs:extension base="ifc:IfcControl">
    <xs:attribute name="PredefinedType" type="ifc:IfcActionRequestTypeEnum" use="optional"/>
    <xs:attribute name="Status" type="ifc:IfcLabel" use="optional"/>
    <xs:attribute name="LongDescription" type="ifc:IfcText" use="optional"/>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
 <xs:element name="IfcActor" type="ifc:IfcActor" substitutionGroup="ifc:IfcObject" nillable="true"/>
 <xs:complexType name="IfcActor">
  <xs:complexContent>
   <xs:extension base="ifc:IfcObject">
    <xs:sequence>
     <xs:element name="TheActor">
      <xs:complexType>
       <xs:group ref="ifc:IfcActorSelect"/>
      </xs:complexType>
     </xs:element>
    </xs:sequence>
   </xs:extension>
  </xs:complexContent>
 </xs:complexType>
 <xs:element name="IfcWarpingMomentMeasure-wrapper" nillable="true">
  <xs:complexType>
   <xs:simpleContent>
    <xs:extension base="ifc:IfcWarpingMomentMeasure">
     <xs:attributeGroup ref="ifc:instanceAttributes"/>
    </xs:extension>
   </xs:simpleContent>
  </xs:complexType>
 </xs:element>
</xs:schema>

Goal

I want to have all the root elements ‘xs:element’ as features:

1. <xs:element name="uos" type="ifc:uos" abstract="true"/>

2. <xs:element name="ifcXML" type="ifc:ifcXML" substitutionGroup="ifc:uos"/>

3. <xs:element name="IfcActionRequest" type="ifc:IfcActionRequest" substitutionGroup="ifc:IfcControl" nillable="true"/>

4. <xs:element name="IfcActor" type="ifc:IfcActor" substitutionGroup="ifc:IfcObject" nillable="true"/>

5. <xs:element name="IfcWarpingMomentMeasure-wrapper" nillable="true">
    <xs:complexType>
     <xs:simpleContent>
      <xs:extension base="ifc:IfcWarpingMomentMeasure">
       <xs:attributeGroup ref="ifc:instanceAttributes"/>
      </xs:extension>
     </xs:simpleContent>
    </xs:complexType>
   </xs:element>

What I did so far

If I use the XMLFragmenter or XMLXQueryExtractor it always gets me additionally the child-elements from xs:complexType etc.

I may have troubles the the XQuery expression.

Can anybody help me out?

Cheers,
Maria

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