Mike,

>Is it possible to dynamically create controls in a form based on XML?

George Nava has been working on something like this for some time, called FOXML (not be confused with a similarly-named spec for Fedora).

Here is some info where you'll find specs and a link to a sample project: http://georgenava.com/foxml/foxml.html

I haven't looked at it closely enough to know how well-developed the concept is, but it sounds like the type of capability you're looking for.