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Re: [xsl] Count of template matches


Subject: Re: [xsl] Count of template matches
From: "Wolfgang Laun wolfgang.laun@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 4 Nov 2014 13:58:29 -0000

Michael:
I don't think that I overlooked using position() within template, as
triggered in the apply-templates mode. But as position() is
context-dependent, it will not return the same value as when applied within
a for-each over a summarily constructed sequence of nodes. The requirement
is (cf. that other thread started yesterday) to enumerate certain nodes
across the entire document.

-W

On 4 November 2014 12:49, Michael Kay mike@xxxxxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Are you missing the fact that position() can be used during
> apply-templates processing, in the same way as during for-each processing?
>
> Michael Kay
> Saxonica
> mike@xxxxxxxxxxxx
> +44 (0) 118 946 5893
>
>
>
>
> On 4 Nov 2014, at 11:28, Wolfgang Laun wolfgang.laun@xxxxxxxxx <
> xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> A recent post has asked for a way to produce ordinals for the processing
> of a set of certain nodes.
>
> If you construct a sequence of the required nodes and iterate it (using
> for-each), position() yields the ordinals.
>
> If you use template/apply-templates. you can still determine the offset by
> calling index-of. But this has a catch, since index-of still requires the
> construction of the overall sequence using an XPath expression. But (and
> this is, for me, the catch) that the selection of the nodes that will
> eventually be processed depends on attribute values of template+@match
> and/or apply-templates+@select. This means that you need two ways to
> produce the same sequence of nodes for index-of to work. (I do know that
> XPath is powerful enough. so it's not an issue of not being able to - it's
> just duplicating an effort.)
>
> A function like fn:nth-time-around() in the context of a template would
> take care of the problem, which (apparently) isn't frequent enough to
> warrant such a function.
>
> Perhaps I'm simply ignorant of something?
> -W
>
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