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Hi, 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. If you run it with more nodes in the xml you’ll get
even slower performance. Thanks, tim Xml <?xml version="1.0"
encoding="utf-8"?> <document> <node id='1'/> <node id='2'/> <node id='3'/> <node id='4'/> <node id='5'/> ..etc etc <node id=’2000’/> </document> Xsl <xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform' > <xsl:output method='text'
version='1.0' encoding='utf-8' indent='no'/> <!-- <xsl:key
name="idKey" match="/document/node[ id='-1']"
use="@id" /> --> <xsl:key
name="idKey" match="/document/node[ id='2000']"
use="@id" /> <xsl:template
match="/">
<xsl:value-of select="count(
key('idKey', /document/node/@id)
)"
/>
</xsl:template> </xsl:stylesheet> With <xsl:key
name="idKey" match="/document/node[ id='-1']"
use="@id" /> [tomcat hulk xsltests]$ xsltproc -timing -profile test.xsl
test.xml.small Parsing stylesheet test.xsl took 0 ms Parsing document test.xml.small took 2 ms number
match
name mode Calls Tot 100us Avg
0
/
1 244198 244198
Total
1 244198 Applying stylesheet took 2443 ms 0Saving result took 0 ms With <xsl:key
name="idKey" match="/document/node[ id='2000']"
use="@id" /> [tomcat hulk xsltests]$ xsltproc -timing -profile test.xsl
test.xml.small Parsing stylesheet test.xsl took 0 ms Parsing document test.xml.small took 2 ms number
match
name mode Calls Tot 100us Avg
0
/
1 346 346
Total
1 346 Applying stylesheet took 4 ms 1Saving result took 0 ms |