If you find out, let me know. I'm trying to do the same thing and have
not been successful with JBossWS.
This is a WSDL requirement. A document/literal message allows for arbitrary content, but it requires that the containing tag name be defined.
If you truly want dynamic content, then I would suggest using the SAAJ API with a servlet. However, due to this WSDL constraint you can not publish a legal WSDL file for such a service.