The first time I posted about using music markup in DocBook, someone stated including the namespaces of MusicXML in Docbook. Sadly, MusicXML within DocBook is like shooting yourself in the foot; the format was designed as a container for all the data of a score, including formatting. It's not meant to be understood or even read by humans, just parsers. Putting it in DocBook would make the documents so complex, I don't even want to think about it. The main use of MusicXML is between Finale and Sibelius, and they generally try to keep you "fenced in" to having to use only their software. I'm looking for an open source solution that doesn't make me feel like there's no other option but to use commercial software. Surely, that was the initial intention of DocBook, too, at some point?