XML for Astronomy/Astrophysics

I was wondering if anyone had some good links / mailing lists for XML for
Astronomy. I spent some time on google and the Cover Pages (both having good
results) but a lot of what I have run into has led back to
http://xml.gsfc.nasa.gov/  which seems good, and at least recently updated.
Many of the other formats and lists are considerably older and language
dependent (e.g. in AIML there is type="java.lang.String"). I am looking for
something pretty generic I suppose, but if someone has a hot link for
marking up radio telescope output I am game for any language (even IDL). To
push the question a little further-- has anyone seen SVG used in conjunction
with such data?

Thanks
Jeff Rafter