key() function can be used as a step inside XPath expressions. In this example the XPath expression leads to nodes kkk which are then used as the second arguments of the key function. This function then returns a sequence of nodes matching keys "Z" and "X" in document order.
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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:template match="/aaa"> <xsl:apply-templates select="bbb/ddd/kkk/key('kkk',.)"/> </xsl:template> <xsl:template match="*"> <xsl:copy-of select="."/> </xsl:template> </xsl:stylesheet> |
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XML
<aaa> <bbb id="b1"> <ccc c="X">1</ccc> <ccc c="Y">2</ccc> <ddd> <kkk>Z</kkk> </ddd> </bbb> <bbb id="b2"> <eee> <fff> <ccc c="Z">3</ccc> <ccc c="X">4</ccc> <ccc c="Z">5</ccc> </fff> </eee> <ddd> <kkk>X</kkk> </ddd> </bbb> </aaa> |
Output
<ccc c="X">1</ccc> <ccc c="Z">3</ccc> <ccc c="X">4</ccc> <ccc c="Z">5</ccc> |
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