GUI tool for building XML to XML stylesheets.

A coworkers is looking for a graphical tool to help him build XML to XML
stylesheets.  The tool would read two DTDs, one representing the source
documents and one representing the destination documents, and then allow
the user to graphically map fields (elements, attributes) from the
source to the destination.  The output of the tool would be an XSLT
stylesheet that implements the necessary transformations.  The idea
sounds reasonable, does anyone know of any graphical tools for doing
this?

Thanks!


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