These class-based attributes use data.ACCIDENTAL.GESTURAL.basic
att.keySig.anl/@accidContains an accidental for the tonic key, if one is required, e.g., if @pname
equals c and @accid equals s, then a tonic of C# is indicated.
att.keySigDefault.anl/@key.accidContains an accidental for the tonic key, if one is required, e.g., if @key.pname
equals c and @key.accid equals s, then a tonic of C# is indicated.
These other Data Types reference data.ACCIDENTAL.GESTURAL.basic