<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 ref="DocumentReference" minOccurs="0" maxOccurs="unbounded" /> <xsd:element ref="Attachment" minOccurs="0" maxOccurs="unbounded" /> </xsd:sequence> </xsd:group>