[..] As opposed to a "file format", however, the only reliable reader (not just interpreter) of LilyPond files is LilyPond itself. That's a disadvantage for interfacing with other programs.
Not really a fundamental problem I would think: Lilypond could be instructed to lower its input into musicxml or whatever the other program understands. Going back to lilypond if really needed is also possible if you accept some loss of information (midi2ly or something more sophisticated).
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