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> |
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| 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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