(MEI.midi) Groups elements which group MIDI-like elements.
(MEI.cmn) Groups elements that may appear within a CMN measure.
<measure>Unit of musical time consisting of a fixed number of note values of a given type,
as
determined by the prevailing meter, and delimited in musical notation by bar lines.
<measure>Unit of musical time consisting of a fixed number of note values of a given type,
as
determined by the prevailing meter, and delimited in musical notation by bar lines.