XML User Interface Language (XUL)
XUL (XML User Interface Language) is Mozilla's XML-based language that lets you build feature-rich cross platform applications that can run connected or disconnected from the Internet.
XUL defines a namespace associated with the URI http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul
Ample SDK implementation details
At the present, XUL implementation in Ample SDK lacks of RDF-based data-binding support.