Is there an application that can help someone create an XML document based on the Relax NG schema?

I've spent a bit of time creating a Relax NG schema for use within our team to validate XML documents we use for exchanging information. The schema is not complicated, but it is reasonably large.

I am wondering if there exists a tool that can read in such a Relax NG schema and assist a user in creating a corresponding instance document, using the schema as a template. Perhaps an application with a GUI that creates fields and drop-down selections for each part of the document?

For example, the tool might create an outline XML document and prompt the user to se开发者_高级运维lect multiples of certain elements, fill in each field, perhaps with permitted values read directly from the schema. It might also show the user via visual feedback when their document is 'complete', or highlight validation problems as they come up.

I could anticipate writing a custom GUI tool to create such an XML document, but I'd really like changes to the schema to be automatically reflected by the GUI - and I really wonder if this hasn't already been done.

I know some editors can automatically validate an XML document against a schema as it's being written, but I would really like to get my users one step away from the XML so they don't have to worry about the details of the XML syntax.

The Sun XML Instance Generator does this job, but the links to it seem to have rotted since Oracle took over Sun. Ask someone for a copy, I guess, or poke around the Web.

Look to http://www.thaiopensource.com/nxml-mode/ from creator on Relax-NG!

This is Emacs based mode. It bundled with Emacs 23 and upper versions!

Never did find a completely suitable solution to this question. One promising avenue was to convert the RelaxNG schema to XML Schema (XSD) and then use the Eclipse editor's XML schema support to guide data entry, but we never took it far enough to know for sure.