<xsd:group name="ReferencesGroup"> <xsd:annotation> <xsd:documentation source="http://www.openapplications.org/oagis/9"> Common References to DocumentReferences and Attachements </xsd:documentation> </xsd:annotation> <xsd:sequence> <xsd:element maxOccurs="unbounded" minOccurs="0" ref="DocumentReference" /> <xsd:element maxOccurs="unbounded" minOccurs="0" ref="Attachment" /> </xsd:sequence> </xsd:group>