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Key instruction and key function.

Keys are very potent tools in the armory of an XSLT programmer. While it may take some time before mastering the concept, the effort pays off.

Keys are defined using xsl:key element. The name attribute provides a name for the key, the match attribute determines which nodes in the source document will be matched and the use attribute specifies the criterium which decides whether the node matches or not. Function key() then selects nodes based on a key.

In this example the key "kkk" matches all "bbb" elements in the source document. The function key('kkk','a') selects all "bbb" elements which have their attribute "x" equal to 'a' (determined by use).

XSLT

<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="2.0">
<xsl:output method="xml"
indent="yes"
omit-xml-declaration="yes"/>
<xsl:key name="kkk"
match="bbb"
use="@x"/>

<xsl:template match="/aaa">
<xsl:apply-templates select="key('kkk','a')"/>
</xsl:template>

<xsl:template match="bbb">
<uuu>
<xsl:value-of select="."/>
</uuu>
</xsl:template>

</xsl:stylesheet>
XML

<aaa>
<bbb x="a">1</bbb>
<ccc>
<bbb x="b">2</bbb>
</ccc>
<ddd>
<eee>
<bbb x="a">3</bbb>
</eee>
</ddd>
</aaa>
Output

<uuu>1</uuu>
<uuu>3</uuu>


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4-19-2013

4-19-2013

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