ops.xsd

<schema
  xmlns='http://www.w3.org/2000/10/XMLSchema'
  targetNamespace='http://www.w3.org/namespace/'
  xmlns:t='http://www.w3.org/namespace/'>

 <element name='OPS_envelope'>
  <complexType>
   <sequence>
    <element ref='t:header'/>
    <element ref='t:body'/>
   </sequence>
  </complexType>
 </element>

 <element name='header'>
  <complexType>
   <sequence>
    <element ref='t:version'/>
    <element ref='t:msg_id'/>
    <element ref='t:msg_type'/>
   </sequence>
  </complexType>
 </element>

 <element name='body'>
  <complexType>
   <sequence>
    <element ref='t:data_block'/>
   </sequence>
  </complexType>
 </element>

 <element name='data_block'>
  <complexType>
   <choice>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
   </choice>
  </complexType>
 </element>

 <element name='dt_assoc'>
  <complexType>
   <choice>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
    <sequence minOccurs='0' maxOccurs='unbounded'>
     <element ref='t:item'/>
    </sequence>
   </choice>
  </complexType>
 </element>

 <element name='dt_array'>
  <complexType>
   <choice>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
    <sequence minOccurs='0' maxOccurs='unbounded'>
     <element ref='t:item'/>
    </sequence>
   </choice>
  </complexType>
 </element>

 <element name='dt_scalar'>
  <complexType mixed='true'>
   <choice minOccurs='0' maxOccurs='unbounded'>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
   </choice>
  </complexType>
 </element>

 <element name='dt_scalarref'>
  <complexType mixed='true'>
   <choice minOccurs='0' maxOccurs='unbounded'>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
   </choice>
  </complexType>
 </element>

 <element name='item'>
  <complexType mixed='true'>
   <choice minOccurs='0' maxOccurs='unbounded'>
    <element ref='t:dt_assoc'/>
    <element ref='t:dt_array'/>
    <element ref='t:dt_scalar'/>
    <element ref='t:dt_scalarref'/>
   </choice>
   <attribute name='key' type='string' use='required'/>
   <attribute name='class' type='string' use='optional'/>
  </complexType>
 </element>

 <element name='msg_id'>
  <complexType mixed='true'>
  </complexType>
 </element>

 <element name='msg_type'>
  <complexType mixed='true'>
  </complexType>
 </element>

 <element name='version'>
  <complexType mixed='true'>
  </complexType>
 </element>
</schema>