I would have liked to participate in this group if my programming skills were good enough… Unfortunately I have no experience with C++ and my programming skills are very basic. (I am not a computer scientist.)
Anyway, I think it would be very useful if SC could support musicXML export, and I tried it for three weeks with a function. You can find it in the following thread
I do not know how many people in this group are interested in such work. I would like to participate in this group if my design could be a starting point for musicXML support in sclang.