http://www.aerodynamika.com/cgi-bin/yabb/YaBB.cgi?board=XML I've set up an XML parts repository board at the FFDS form.
Basically it's NOT a Board to ask how to code XML, but rather a place to post a working XML coded animation part.
The way it's turning out is that the "development and discussion" gets done in the regular design forum (such as this one in Simviation, or at that august institution of FlightSim Modelling Higher Education - FFDS - and then the "final" code is polished and placed in the XML Parts board.
I'm not limiting it to just animations/parts, but also gauges.