<xs:group name="mei_model.layerPart.neumes_sequenceOptional"> <xs:sequence> <xs:group minOccurs="0" ref="mei:mei_model.eventLike.neumes_sequenceOptional"/> <xs:group minOccurs="0" ref="mei:mei_model.syllableLike_sequenceOptional"/> </xs:sequence> </xs:group> |