Re: [xsl] Comparing nodes in axis

[António Mota <xptm@xxxxxxx>]

I had that in mind from the begining, but for some strange reason i forgot to
do
it (maybe i'm getting old...).

My case is very simple, so a simple

<xal:variable name="thismenu" select="(//menu)[$pos])"/>

and the use of the var instead of the expression will work ok.

Thanks from remind me...



Quoting David Carlisle <davidc@xxxxxxxxx>:

>
> Note in all these you have multiple occurrences of (//menu)[$pos]) this
> is (on the face of it) a massively expensive operation: search the
> entire document to an arbitrary depth, looking for menu nodes, and then
> select the $pos'th menu.
>
> It may be that your processor spots that the same expression is being
> used multiple times and optimises away some of the cost but it's still
> going to take at least one very slow search. You could at least help it
> by saving <xal:variable name="thismenu" select="(//menu)[$pos])"/>
> and using $thismenu instead, and possibly (depending on the details of
> your stylesheet) you should get rid of the $pos parameter altogether and
> just use the $thismenu parameter. Often when people coming to xslt ffrom
> other languages pass around an integer parameter and repeatedly re-index
> into some node list, they are just used to the less natural data
> structures in those languages, in xslt if a template depends on anode,
> you can pass that node in as a parameter, you don't have to pass in an
> integer and make it select the node.
>
> David
>
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