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

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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

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.

John (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

Current Thread

Re: Does the count() function require access to the whole subtree?, (continued)
- Costello, Roger L. - 14 Jan 2014 10:11:13 -0000
  - John Lumley - 14 Jan 2014 10:30:33 -0000
    - John Lumley - 14 Jan 2014 10:43:45 -0000 <=
    - Peter West - 14 Jan 2014 11:59:28 -0000
  - Michael Kay - 14 Jan 2014 12:26:19 -0000
    - Dimitre Novatchev - 14 Jan 2014 14:51:27 -0000
    - Wendell Piez - 14 Jan 2014 15:24:43 -0000

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