MAME XML help

[LGC]

Hi all.

I'm trying to get a better grasp on the mame xml output file and I was wondering if someone here knows of such a 'help'-file.
Some of the elements/attributes are not very clear to me or I'm wondering if 'controls.dat' (and the other specialized files) contain better info ...

The main reason for asking is to merge all that info into a single file, so I can filter out relevant games for the next step in my project (front-end).
It's not going to be a rom-manager, but more like ROMLister (tried the latest version, but it's messing up the output xml somehow).
Also I'm not completely happy with the way games are categorized, I think there are games that fall into multiple categories (might be a better file out there I haven't discovered yet though).


thx.