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.
One or more values of datatype
a string matching the following regular expression: "(%all|#[\i][\c]+)"
, separated by spaces.
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 of datatype
a string matching the following regular expression: "(%all|\d+(-\d+)?)"
, 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.
startid(optional)Holds a reference to the first element in a sequence of events to which the feature
applies.
Value conforms to data.URI.
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.