Xml: Extensible Markup Language

Well I've not tried this before but if you do have the form designed in XML then you have to use some form
of XQL (i.e. XML Query Language) to execute any sort of query.

Try seaching on Google for 'XML Query Language' to get some probable solutions but this might be DBMS-specific.

If you don't want to learn XML ( which would be kind of silly since you have a form created in XML) you might want to write a [rogram in Java or C++ or C# to connect to the Database and execute the stored procedure and also generate the XML file, which you can then generate a form out of.

All of this is theoretical of course but I hope it helps.