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Re: improving performance in creating ids

Subject: Re: improving performance in creating ids
From: "Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 23 Apr 2019 14:56:55 -0000
Re:  improving performance in creating ids
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]"/>

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.

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