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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.


            <xsl:output  method="xml"
            <xsl:key  name="kkk"

            <xsl:template  match="/aaa">
                  <xsl:apply-templates  select="ccc/ddd"/>

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


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


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