<xs:group name="music-data"><xs:annotation><xs:documentation>The music-data group contains the basic musical data that is either associated with a part or a measure, depending on whether the partwise or timewise hierarchy is used.</xs:documentation></xs:annotation><xs:sequence><xs:choice maxOccurs="unbounded"><xs:element name="note" type="note"/><xs:element name="backup" type="backup"/><xs:element name="forward" type="forward"/><xs:element name="direction" type="direction"/><xs:element name="attributes" type="attributes"/><xs:element name="harmony" type="harmony"/><xs:element name="figured-bass" type="figured-bass"/><xs:element name="print" type="print"/><xs:element name="sound" type="sound"/><xs:element name="barline" type="barline"/><xs:element name="grouping" type="grouping"/><xs:element name="link" type="link"/><xs:element name="bookmark" type="bookmark"/></xs:choice></xs:sequence></xs:group>