<xs:attributeGroup name="print-object"><xs:annotation><xs:documentation>The print-object attribute specifies whether or not to print an object (e.g. a note or a rest). This is especially useful for notes that overlap in different voices, or for chord sheets that contain lyrics and chords but no melody. It is yes by default.</xs:documentation></xs:annotation><xs:attribute name="print-object" type="yes-no"/></xs:attributeGroup>