A useful example of context change with the third argument of key Surf Skate Snow Surfing Skateboard

This example demonstrate a common case where the third argument comes handy. The keys are supplied as a nodes inside xsl:variable and the xsl:for-each element has this variable as its root node. The first key() function therefore does not match anything as the source document is outside the scope of xsl:for-each. The second key() uses its third argument to use the source document for its work.

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:variable  name="xxx">
                  <k>Y</k>
                  <k>Z</k>
                  <k>X</k>
            </xsl:variable>
            <xsl:variable  name="root"
                        select="/"/>

            <xsl:template  match="/aaa">
                  <xsl:for-each  select="$xxx/*">
                        <key  id="{.}">
                              <xxx>
                                    <xsl:apply-templates  select="key('kkk',.)"/>
                              </xxx>
                              <yyy>
                                    <xsl:apply-templates  select="key('kkk',.,$root)"/>
                              </yyy>
                        </key>
                  </xsl:for-each>
            </xsl:template>

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

      </xsl:stylesheet>

XML

Output

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A useful example of context change with the third argument of key()