<xs:schema xmlns:xs='http://www.w3.org/2001/XMLSchema'
		   elementFormDefault='qualified'>

  <!-- ====================================================== -->
  <!-- This format only supports a single structure per file. -->
  <!-- Although multiple ones could easily  be added that is  -->
  <!-- not  necessarily true of other  serialization types so -->
  <!-- this one is restricted for consistency.                -->
  <!-- ====================================================== -->
  <xs:element name='structure' type='Structure'/>

  <xs:complexType name='Structure'>

    <xs:sequence>
      <!-- Mandatory structure name -->
      <xs:element name='name' type='xs:string'/>

      <!-- List of structure members (must be at least one for a legal structure) -->
      <xs:sequence minOccurs='1' maxOccurs='unbounded'>
        <xs:element name='member' type='Member'/>
      </xs:sequence>
    </xs:sequence>

  </xs:complexType>

  <!-- ====================================================== -->
  <!-- Individual member of a structure.                      -->
  <!-- ====================================================== -->
  <xs:complexType name='Member'>

    <xs:sequence>
      <!-- Mandatory structure member name -->
      <xs:element name='name' type='xs:string'/>

      <!-- Mandatory structure member type element -->
      <xs:element name='type' type='MemberType'/>

      <!-- Optional non-zero dimension element -->
      <xs:element name='dim' minOccurs='0'>
        <xs:simpleType>
          <xs:restriction base='xs:integer'>
            <!-- 0 and lower dimensions do not make sense -->
            <xs:minInclusive value='1'/>
          </xs:restriction>
        </xs:simpleType>
      </xs:element>
    </xs:sequence>

  </xs:complexType>

  <!-- ====================================================== -->
  <!-- Available member types, matched with the source code   -->
  <!-- ====================================================== -->
  <xs:simpleType name='MemberType'>
    <xs:restriction base='xs:string'>
      <xs:enumeration value='bool'   />
      <xs:enumeration value='double' />
      <xs:enumeration value='dbl4x4' />
      <xs:enumeration value='float'  />
      <xs:enumeration value='flt4x4' />
      <xs:enumeration value='int8'   />
      <xs:enumeration value='int16'  />
      <xs:enumeration value='int32'  />
      <xs:enumeration value='int64'  />
      <xs:enumeration value='string' />
      <xs:enumeration value='uint8'  />
      <xs:enumeration value='uint16' />
      <xs:enumeration value='uint32' />
      <xs:enumeration value='uint64' />
    </xs:restriction>
  </xs:simpleType> 

</xs:schema>