DOM and XSL

This is what I want to do.  I want to read two XML documents into memory,
maybe into DOM objects.  Then I want to combine the two documents (they both
represent data sets, I want to create the union, or intersection, of these
datasets), into possibly another DOM object.  Then I want to convert this
DOM representation of an XML doc into an HTML doc using XSL.

Two questions

--  Any recommendations for a good XML DOM implementation to do this kind of
manipulation?

-- Anyone know any DOM based XSL engines?

Thanks in Advance,
Tap


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