Is it really the case that the protocol between parser and validator
could become a huge performance drain? 

I would have expected it to be a quiet conversation in comparison to the
noise of Unicode character lookups, URL fetches, lexical analysis,
well-formedness checking, and so forth. My experience is that the best
XML parsers often work at IO speeds (at least on my computer) so there
is probably time to spare for a little abstraction and code reuse.

What if I want to validate the result of an Xalan transform. Do I have
to stream it to disk?
-- 
 Paul Prescod  - ISOGEN Consulting Engineer speaking for himself
"Remember, Ginger Rogers did everything that Fred Astaire did,
but she did it backwards and in high heels."
                                               --Faith Whittlesey

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