Re: XML Schemas

The other obvious, although heavyweight answer, is to look into the 
Eclipse EMF and XSD tools, which give a ton of information about schemas, 
and support auto-generating code to create editors for a schema (although 
not, perhaps, as simply editable code as your application needs).  It's 
worth skimming the docs tho.

http://eclipse.org/emf/xsd.php

- Shane