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A useful example of context change with the third argument of key()

This example demonstrate a common case where the third argument comes handy. The keys are supplied as a nodes inside xsl:variable and the xsl:for-each element has this variable as its root node. The first key() function therefore does not match anything as the source document is outside the scope of xsl:for-each. The second key() uses its third argument to use the source document for its work.

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="ccc"
use="@c"/>
<xsl:variable name="xxx">
<k>Y</k>
<k>Z</k>
<k>X</k>
</xsl:variable>
<xsl:variable name="root"
select="/"/>

<xsl:template match="/aaa">
<xsl:for-each select="$xxx/*">
<key id="{.}">
<xxx>
<xsl:apply-templates select="key('kkk',.)"/>
</xxx>
<yyy>
<xsl:apply-templates select="key('kkk',.,$root)"/>
</yyy>
</key>
</xsl:for-each>
</xsl:template>

<xsl:template match="*">
<xsl:copy-of select="."/>
</xsl:template>

</xsl:stylesheet>
XML

<aaa>
<bbb id="b1">
<ccc c="X">1</ccc>
<ccc c="Y">2</ccc>
<ddd>
<ccc c="Z">3</ccc>
</ddd>
</bbb>
<bbb id="b2">
<eee>
<fff>
<ccc c="X">4</ccc>
</fff>
</eee>
</bbb>
</aaa>
Output

<key id="Y">
<xxx/>
<yyy>
<ccc c="Y">2</ccc>
</yyy>
</key>
<key id="Z">
<xxx/>
<yyy>
<ccc c="Z">3</ccc>
</yyy>
</key>
<key id="X">
<xxx/>
<yyy>
<ccc c="X">1</ccc>
<ccc c="X">4</ccc>
</yyy>
</key>


Previous chapter: Namespaces
Next chapter: Recursions
Previous page: Using keys in variables or parameters
Next page: Function key inside an XPath expression

4-19-2013

4-19-2013

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