sample/src/main/resources/sports.xsd

<?xml version="1.0" encoding="UTF-8"?>
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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:sdoJava="commonj.sdo/java"
            xmlns:sdoXML="commonj.sdo/xml"
            xmlns:spt="http://www.apache.org/tuscany/sports"
            targetNamespace="http://www.apache.org/tuscany/sports">
  
  <xsd:element name="union" type="spt:SportingUnion"/>
    
  <xsd:complexType name="SportingUnion">
    <xsd:sequence>
      <xsd:element name="member" type="spt:Player" maxOccurs="unbounded" />
      <xsd:element name="team" type="spt:Team" maxOccurs="unbounded" />
    </xsd:sequence>
  </xsd:complexType>
  
  <xsd:complexType name="Player">
    <xsd:sequence>
      <xsd:element name="name" type="xsd:string"/>  
    </xsd:sequence>
    <xsd:attribute name="ID" type="xsd:ID"/>
    <xsd:attribute name="captainFor" type="xsd:IDREF" sdoXML:propertyType="spt:Team"/>
  </xsd:complexType>
  
  <xsd:complexType name="Team">
    <xsd:sequence>
      <xsd:element name="name" type="xsd:string"/>
      <xsd:element name="player" type="xsd:IDREF" maxOccurs="unbounded"/>
    </xsd:sequence>
    <xsd:attribute name="ID" type="xsd:ID"/>
    <xsd:attribute name="captain" type="xsd:IDREF" sdoXML:oppositeProperty="captainFor" sdoXML:propertyType="spt:Player" />
  
  </xsd:complexType>


</xsd:schema>