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Re: XPath filters equivalence

From: Altu <altu59@-----.--->
To: NULL
Date: 10/6/2007 4:37:00 AM

Hi Joe,

> Depends on the predicate. If p2 or p3 tests position() or last(), _NO_
> -- the latter form would test position in the original set, while the
> former would test position in the set that has gotten past the
> preceeding filter(s).

p1, p2, and p3 are simple paths that only have ., /, //, and * like

 ./a/b//c/d//*

 or

 //a/b//c//*

> In these examples: no, since an absolute XPath by definition ignores its
> context and since if it fails in any of these the result is that we find
> no nodes. (Though for performance reasons in typical processors, you
> will probably want to test it earlier rather than later).
> In more complicated XPaths, maybe.

Other than performance difference, if my predicates are also simple
predicates like the case above, so I think they all return the same
result, is this correct?

Regards,
Al


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