mapping an XML file to another?

Anybody know of any software out there that will take two XML files as input (or
maybe even two DTD files as input instead), allow the user to map the fields of
one XML file to the other, and then get an XSLT script that can be used later to
automatically convert the source XML to the destination XML.  Or anything close
to that idea.

Also, does anyone know if there exists a java bean or some kind of open-source
code for a GUI that displays a DTD in a treeview format?

Thanks,
Michael J. Hudson




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