+
+@menu
+ * 01 ... Pitches
+ * 02 ... Rests
+ * 03 ... Rhythm
+ * 11 ... Time signatures
+ * 12 ... Clefs
+ * 13 ... Key signatures
+ * 21 ... Chorded notes
+ * 22 ... Note settings heads etc.
+ * 23 ... Triplets Tuplets
+ * 24 ... Grace notes
+ * 31 ... Dynamics and other single symbols
+ * 32 ... Notations and Articulations
+ * 33 ... Spanners
+ * 41 ... Multiple parts (staves)
+ * 42 ... Multiple voices per staff
+ * 43 ... One part on multiple staves
+ * 45 ... Repeats
+ * 46 ... Barlines Measures
+ * 51 ... Header information
+ * 52 ... Page layout
+ * 61 ... Lyrics
+ * 71 ... Guitar notation
+ * 72 ... Transposing instruments
+ * 73 ... Percussion
+ * 74 ... Figured bass
+ * 75 ... Other instrumental notation
+ * 90 ... Compressed MusicXML files
+ * 99 ... Compatibility with broken MusicXML
+@end menu
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