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key() as the first step of an XPath expression

key() function returns a sequence of nodes which can be further queried using standard XPath expressions.


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

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

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


            <bbb  id="a">
                  <bbb  id="b">


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