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musicxml2ly does not support non-numeric lyric numbers which are (accide

From: Hans Aikema
Subject: musicxml2ly does not support non-numeric lyric numbers which are (accidentally) allowed by the MusicXML spec
Date: Sat, 11 Sep 2021 12:52:50 +0200

Running a MusicXML-to-lilypond conversion for a score I received from the 
arranger as a Sibelius 8.3.0 MusicXML export (Direct export, not from Dolet) I 
encoutered breaking errors due to Sibelius’ use of none-numerical lyric numbers 
(part<n>verse<m>) in at least the part-wise scores.

This case is documented online [1] [2] [3] as a known issue in MusicXML (which 
has not been resolved up to now, and probably never will given the time passed 
since it was raised).

I think lilypond’s musicxml2ly should support conversion of such none-numerical 
lyric numbers.
Preferably by grouping lyrics based on the NMTOKEN stringvalue (as number 
attribute semantics is “Specifies the lyric line when multiple lines are 
present.” different values should be expected to refer to different lyric 
Or if that would be difficult to achieve by ignoring none-numerical lyric 
numbers, grouping all such ’non-numerical lyric number’ lyrics into a single 
lyric line, and only issue a conversion warning that non-numerical lyric 
numbers were encountered and the corresponding lyrics merged into a single 
lyrics line.

Attached is a minimal example MusicXML that demonstrates the issue. 

It shows that measure number, which is clearly documented in the spec to be a 
’number’ that might contain non-numerical data, is properly supporting 
conversion to lilypond for non-numerical measure numbers as the conversion 
breaks only on measure ‘b’, the first measure with a non-numerical lyric number 
(which is not clearly documented in the spec for being a ‘number’ field that 
might contain non-numerical data)).

Attachment: XMLLyricsNumberNMToken.musicxml
Description: Binary data

The resulting log of musicxml2ly:
musicxml2ly: Reading MusicXML from /Users/**/**/XMLLyricsNumberNMToken.musicxml 
Traceback (most recent call last):
  File "/opt/local/bin/musicxml2ly", line 3479, in <module>
  File "/opt/local/bin/musicxml2ly", line 3472, in main
    voices = convert(filename, options)
  File "/opt/local/bin/musicxml2ly", line 3333, in convert
    (voices, staff_info) = get_all_voices(parts)
  File "/opt/local/bin/musicxml2ly", line 2910, in get_all_voices
    all_voices = voices_in_part_in_parts(parts)
  File "/opt/local/bin/musicxml2ly", line 2900, in voices_in_part_in_parts
    voices = voices_in_part(p)
  File "/opt/local/bin/musicxml2ly", line 2887, in voices_in_part
  File "/opt/local/share/lilypond/2.22.1/python/musicxml.py", line 1588, in 
  File "/opt/local/share/lilypond/2.22.1/python/musicxml.py", line 1251, in 
    nr = l.get_number()
  File "/opt/local/share/lilypond/2.22.1/python/musicxml.py", line 971, in 
    return int(self.number)
ValueError: invalid literal for int() with base 10: 'b'

[1] https://github.com/w3c/musicxml/issues/42
[2] https://forums.makemusic.com/viewtopic.php?f=12&t=2392#p6460
[3] https://musescore.org/en/node/13760

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