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   RE: [xml-dev] XQuery and DTD/Schema?

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Fair enough. I don't really smell conspiracy here. I hope that it will not
be technically or politically impossible for vendors to use RELAX NG
provided that RELAX NG does the right thing wrt type assignment.


Rick Jelliffe wrote:
> XQuery was under way (in some form) before RELAX was developed, and
> certainly before RELAX NG.  Just as RELAX came too too late to
> influence the fundamental stages of WXS, so RELAX NG is too
> late to influence the fundamental stages of XQuery.
> Furthermore, the point of XQuery (rightly or wrongly: depends on your use
> cases and your vision of the Web) is to make use of types: RELAX
> NG has been
> explicitly not about types in that same way.  So there is a
> technical impediment
> too.
> But now RELAX NG is out, and clearly viable and attractive, there
> are different
> dynamics.  First, the RELAX NG people are, I think, looking at
> various ways
> that RELAX NG could be more useful for queries. Second, there is
> discussion
> at the W3C to disconnect XQuery from WXS validation (see Tim Bray's
> comments on the TAG public list).  Such a Type-augmented Infoset
> (TAI rather
> than a PSVI) would still be based on the categories established in WXS,
> but it would be clearer that the augmentations could come from different
> schema languages. I expect that this is the way things will with XQuery
> and subsequent revisions of WXS.
> So we shouldn't see XQuery per se as a conspiracy against RELAX NG.
> However, the general idea that an XPath 2 (in particular) implementation
> would require a WSX validator does unfairly privilege WXS (and a TAI),
> and that is the wrong direction.
> Cheers
> Rick Jelliffe


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