Variable shadowing

      <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">xxx-global</xsl:variable>
            <xsl:variable  name="yyy">yyy-global</xsl:variable>

            <xsl:template  match="/aaa">
                  <xsl:variable  name="xxx">xxx-local</xsl:variable>
                  <xsl:variable  name="zzz">zzz-local</xsl:variable>
                  <i>
                        <xsl:value-of  select="$xxx"/>
                  </i>
                  <ii>
                        <xsl:value-of  select="$yyy"/>
                  </ii>
                  <iii>
                        <xsl:value-of  select="$zzz"/>
                  </iii>
            </xsl:template>

      </xsl:stylesheet>

      <aaa/>

      <i>xxx-local</i>
      <ii>yyy-global</ii>
      <iii>zzz-local</iii>