How do you access you're CICS data? Is it thru plain old BMS and a 3270 terminal? Or perhaps you are using SOAP or HTTP via CWS?
Whatever it is you are doing, or planning to do, do not convert you're BMS maps in CICS to XML before presenting it to the enduser.
If you do do that, put a call in to you're legal department and ask them to take a look at
U.S. Patent Number 6,981,257 B2.
Here is an abstract of the patent: