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Just a clarification - W3C's tests are to test whether the specification can be implemented, not to test individual implementations. So although it's true we ask venders to run the tests, our goal isn't to stamp the products with a seal of approval but to stamp the spec with a seal of approval :-)
Also, I think that working with the XSL WG has made the resulting XQuery simpler for both implementers and developers: there was a lot of experience with XSLT, and making XQuery's XPath expressions be as compatible as possible with those of XSLT 2.0 has been a big win all round.
On the other hand, it did delay both XSLT 2.0 and XQuery.
Liam
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