Re: [xsl] Does the count() function require access to the whole subtree?

[John Lumley <john@xxxxxxxxxxxx>]

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