Storing parts of XML document to a variable

      <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:variable  name="xxx"
                        select="/aaa/bbb/ccc"/>

            <xsl:template  match="/aaa">
                  <xxx>
                        <xsl:value-of  select="$xxx/ddd/@r"
                                    separator=" - "/>
                  </xxx>
                  <yyy>
                        <xsl:value-of  select="name($xxx/ddd/parent::*/parent::*)"/>
                  </yyy>
            </xsl:template>

      </xsl:stylesheet>

      <aaa>
            <bbb>
                  <ccc>
                        <ddd  r="1"/>
                        <ddd  r="2"/>
                        <ddd  r="3"/>
                  </ccc>
            </bbb>
      </aaa>

      <xxx>1 - 2 - 3</xxx>
      <yyy>bbb</yyy>