<xs:attributeGroup name="UndlyInstrumentPartiesAttributes"> <xs:attribute name="ID" type="UnderlyingInstrumentPartyID_t" use="optional" /> <xs:attribute name="Src" type="UnderlyingInstrumentPartyIDSource_t" use="optional" /> <xs:attribute name="R" type="UnderlyingInstrumentPartyRole_t" use="optional" /> </xs:attributeGroup>