att.duration.additive/@durWhen a duration cannot be represented as a single power-of-two value, multiple
space-separated values that add up to the total duration may be used.
att.duration.default/@dur.defaultContains a default duration in those situations when the first note, rest, chord,
etc.
in a measure does not have a duration specified.
att.duration.log/@durRecords the duration of a feature using the relative durational values provided by
the
data.DURATION datatype.