Re: [xsl] Data extraction

["David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Mon, 17 Dec 2018 at 17:54, Mailing Lists Mail daktapaal@xxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hi all
> I have a requirement where I need to write an xslt to extract a particular node from source tree.
>
>
> Someone wrote an xslt that looked like this.. pseudo code
>
> Template Match node()|@*
>   Apply-template select node()|@*
>
> Template match *:ElementToExtract
>     Copy of select .
>
> I thought the developer was making a lot of traversing using the above approach and he could have instead done
>
> Template match "/"
>    Copy of select descendant::*:ElementToExtract
>
>
> Would you agree ? I thought this was very obviously better and faster ...
>
> Forgive my pseudo code.

whether or not it is faster depends on the processor you are using and
how it optimises such searches but in general they are not equivalent
if you can have
<ElementToExtract>...<ElementToExtract>zzz</ElementToExtract>...</ElementToExtract>

Then the first form will return
<ElementToExtract>...<ElementToExtract>zzz</ElementToExtract>...</ElementToExtract>
and the second
<ElementToExtract>...<ElementToExtract>zzz</ElementToExtract>...</ElementToExtract><ElementToExtract>zzz</ElementToExtract

David

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