Is anyone here familiar with

http://www.logilab.org/xmldiff/

Overview

XMLdiff is a python tool that figures out the differences between two
similar XML files, in the same way the diff utility does it for text
files. It was developed for the NARVAL project and should also be used
as a library. It can work either with XML files or DOM trees

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I recall a short discussion here about complications in using CVS
and diff with Leo files because of the XML encoding. I was wondering
if XMLdiff might be useful - especially in the context of the newer
version control systems based on WebDAV which apparently allow one
to use their own diff mechanism. See for example

http://www.webdav.org/

and

http://subversion.tigris.org/

Regards,
Bill Page.