Hi Charline,
Thanks for letting us know.
Our support for the XML file is quickly approaching end-of-life and we're encouraging everyone to move to the sqlite flat file or the json files that we provide now. I'd first suggest seeing if you can get the data you need from either of those - the json file is probably easiest to work with. That said if you can't get what you need out of either of those please let me know and I can bump a fix for this up the priority list.
-Anthony
Anthony S. Castanza, PhD
Curator, Molecular Signatures Database
Mesirov Lab, Department of Medicine
University of California, San Diego