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Re: XPath filters equivalence

From: Peter Flynn <peter.nosp@-.--------.-->
To: NULL
Date: 10/6/2007 8:00:00 PM

Altu wrote:
> 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?

At this stage, why not download a copy of XPathTester and try it for 
yourself?

///Peter


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