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Re: why is count(xpath) != xpath[last()] ?

From: jfrensen@-------.---
To: NULL
Date: 12/12/2007 11:40:00 AM
> That's because Name elements aren't siblings. Each Name element is the
> only Name element row element contains, so at the point when Name
> element is selected, context node-set contains single Name element, so
> last() = 1.

> You need (/root/Students/row/Name)[position() = last()]

Thank you, Oleg.  What confuses me is that the use of the predicate
filter seems to change the order of evaluation of the XPath
expression.
That is,
        select="/root/Students/row/Name"
evaluates to a nodeset of two Names, and
        select="count(/root/Students/row/Name)"
evaluates to the number 2.

Given that, I had assumed that the XPath expression
        select="/root/Students/row/Name[position() = last()]"
would be evaluated from left to right, yielding a nodeset, that would
then be filtered by [position() = last()].  But this does not seem to
be the case, if parentheses are required to change the order of
evaluation.


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