Are there any stable XForms toolkits for Swing?

I want to write a stand alone Java app that can dynamically construct Swing based forms from XForms based form definitions. When the user completes a form (by clicking a Save button or similar), the toolkit should generate the XML for the completed form. My app will then perform additional processing on the generated XML (eg saving it to a file or database or submitting it to a remote web service).

Any suggestions on how to implement this would be much appreciated.