<element name="ReferenceInformation"> <annotation> <documentation>Additional reference information or supporting information for a referenced document. </documentation> </annotation> <complexType> <sequence> <element ref="pidx:ReferenceNumber" minOccurs="0" /> <element ref="pidx:Description" minOccurs="0" /> </sequence> <attribute name="referenceInformationIndicator" type="pidx:ReferenceInformationIndicatorType" use="required" /> </complexType> </element>