> A MusicXML export integrated into LilyPond has been discussed repeatedly, > and everybody agrees that it is desirable, but it has not been implemented > so far because, well, it's quite easier said than done. In a free (libre) > / open source project, the only way to be sure something will get done > is to do it yourself.
I didn't want to sound like complaining! I understand it should be a lot of work to provide. I wasn't sure it was not implemented for technical or ethical reasons.