Re: [xsl] improving performance in creating ids

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On 23.04.2019 16:28, Pieter Lamers pieter.lamers@xxxxxxxxxxxx wrote:

> Thanks for your quick reply. the node identity comparison helped quite a
> bit, although I am still around a minute for a full book of ids. I am
> not sure how xsl:number would help here, and what kind of performance
> win it would give over count(). I tried something with a nested
> transformation, but what should I feed it?
>
>  B B B  <xsl:number select="*[last()]"/>
> works (given a set of preceding nodes) but it is slightly slower than a
> count() in the xquery. Maybe I should be using xsl:number differently?


It is difficult for me to suggest that without knowing the XML input
structure and whether you want to generate that id based on a count or
numbering only for certain nodes or some particular element type. In
general if I wanted to delegate counting to xsl:number similar to your
function I would define a template in a mode for that e.g.

   <xsl:template match="*" mode="number">
      <xsl:number level="any" from="*[@id]"/>
   </xsl:template>

and then, where you need that number, you would use e.g.

   <xsl:apply-templates select="." mode="number"/>

Both the template or the or the select of the apply-templates can of
course be adapted to more particular needs.

As for being more efficient that using count, that then depends on the
implementation but I would think there is some optimization to be
expected in an XSLT processor for xsl:number.