Re: [xslt] long processing time when using key that returns an empty node set

Tim Chen schrieb:

When I have a xsl:key who's select results in no nodes, I notice a
ridiculous increase in processing time.

Below is an example that runs in 4ms when the select returns nodes and
2400ms when no nodes are in the key.

I can confirm this using LibXSLT 1.1.22.

Here's the OP's stylesheet reformatted and a line to generate the

<xsl:stylesheet xmlns:xsl=""; version="1.0">
  <xsl:output method="text" version="1.0" encoding="utf-8" indent="no"/>
  <xsl:key name="idKey" match="/document/node[ id='2000']" use="@id"/>
  <xsl:key name="idKey" match="/document/node[ id='-1']" use="@id"/>
  <xsl:template match="/">
    <xsl:value-of select="count( key('idKey', /document/node/@id) )"/>

perl -lwe 'print for q{<document>}, map( qq{<node id="$_"/>}, 1 .. 2000), q{</document>}'

Michael Ludwig

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