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Keys usage for cross-referencing

Probably the most common usage of keys in XSLT is creation of cross-references. In this stylesheet "ddd" elements are substituted by contents of "bbb" elements.

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="ccc/ddd"/>
</xsl:template>

<xsl:template match="ddd">
<uuu>
<xsl:apply-templates select="key('kkk',@y)"/>
</uuu>
</xsl:template>

</xsl:stylesheet>
XML

<aaa>
<bbb x="a">X</bbb>
<bbb x="b">Y</bbb>
<bbb x="c">Z</bbb>
<ccc>
<ddd y="b"/>
<ddd y="c"/>
<ddd y="a"/>
</ccc>
</aaa>
Output

<uuu>Y</uuu>
<uuu>Z</uuu>
<uuu>X</uuu>


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Next chapter: Recursions
Previous page: Key matching based on element context
Next page: key as the first step of an XPath expression

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4-19-2013

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