@layer(optional)Identifies the layer to which a feature applies.
One or more values of datatype positiveInteger, separated by spaces.
@part(optional)Indicates the part in which the current feature should appear. Use 'all' when the
feature
should occur in every part or 'none' when the feature should not appear in any part.
Value conforms to data.PART.
@partstaff(optional)Signifies the part staff on which a notated feature occurs. Use 'all' when the
feature should occur on every staff.
One or more values from data.PARTSTAFF, separated by spaces.
@staff(optional)Signifies the staff on which a notated event occurs or to which a control event
applies. Mandatory when applicable.
One or more values of datatype positiveInteger, separated by spaces.
@tstamp(optional)Encodes the onset time in terms of musical time, i.e., beats[.fractional beat part],
as expressed in the written time signature.
Value conforms to data.BEAT.