<xs:group name="mei_model.meterSigLike_sequenceOptionalRepeatable"> <xs:sequence> <xs:element minOccurs="0" maxOccurs="unbounded" ref="mei:meterSig"/> <xs:element minOccurs="0" maxOccurs="unbounded" ref="mei:meterSigGrp"/> </xs:sequence> </xs:group>