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Re: Does the count() function require access to the wh

Subject: Re: Does the count() function require access to the whole subtree?
From: John Lumley <john@xxxxxxxxxxxx>
Date: Tue, 14 Jan 2014 10:43:36 +0000
Re:  Does the count() function require access to the wh
On 14/01/2014 10:30, John Lumley wrote:
Imagine a tree which contains somewhere an element whose name is X. Let's call that x1. A descendant of x1 is another element with name X. Let's call that x2.

Invoking //X of course discovers both x1 and x2. Each has its own tree - it's node and it's subtrees. But the tree of x1 overlaps that of x2 - some members of the tree of x1 are in the tree of x2 (In this case it is a total overlap, for other expressions it could be partial.)
Correction - the trees of course cannot have partial overlap (they wouldn't be trees if they were....), though XPath nodesets can have partial overlaps.

(Apologies for "it's" being used incorrectly - must switch that predictive corrector off on the iSomethingOrOther.........)

*John Lumley* MA PhD CEng FIEE
john@xxxxxxxxxxxx <mailto:john@xxxxxxxxxxxx>
on behalf of Saxonica Ltd

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