Thanks etabeta for having a look a xegs and putting it into better shape.
I am continuing work on the a800 cartridges and will have the xml ready in a week or so. There are 261 cartridges in the collection with about 40% working in the current MESS implimentation of the Atari 800/XL/XE.
It might be worth reviewing the Atari 8-bit machine structure as well. Currently the 400, 800, XL/XE, xegs seperated in the MESS heirachy. After some investigation it seems that the 400-800/XL machines are virtually similar and the XE/XEGS have a different memory manager.