Best I've ever seen (though I'm biased since I worked with the author) was
XMLTreeDiff, which did some fairly sophisticated signature-matching so it
could generate a fairly well optimized list of changes ("this was moved
there" rather than "this was deleted and the same thing was inserted"). As
a result, its output was actually more useful than that of many
traditional diff engines.
Unfortunately, it was written back when there was a signature routine
built into the Xerces DOM Implementation, and I don't know whether it has
ever been updated to work with a stand-alone signature engine so it could
run against other DOMs ... or to support namespaced DOMs. I'll ask.
Xalan's test suite is currently using a class called XHTComparitor to
compare XML, HTML, and/or Text output of our testcases with the "gold
file" (official results). But that's generating only go/no-go results
rather than a list of differences, so it might not meet your needs.
______________________________________
Joe Kesselman / IBM Research
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