A small update. I raised the question of representing microtones on
the MusicXML list, and was told that it's perfectly OK to use non-
integer values in <alter> elements. The documentation for the upcoming
MusicXML 0.7 will make this explicit.
On the notation side, the language has a rich collection of accidentals
including quarter-tone accidentals. This comment from the note dtd:
<!--
Actual notated accidentals. Valid values include: sharp,
natural, flat, double-sharp, sharp-sharp, flat-flat,
natural-sharp, natural-flat, quarter-flat, quarter-sharp,
three-quarters-flat, and three-quarters-sharp. Editorial
and cautionary indications, are indicated by attributes.
Values for these attributes are "no" if not present.
-->
Phil Taylor
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