Reading external document using doc function

      <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:template  match="/aaa">
                  <xxx>
                        <available-1>
                              <xsl:value-of  select="doc-available('ext3.xml')"/>
                        </available-1>
                        <available-2>
                              <xsl:value-of  select="doc-available('XYZ.xml')"/>
                        </available-2>
                        <xsl:copy-of  select="doc('ext3.xml')/rrr"/>
                  </xxx>
            </xsl:template>

      </xsl:stylesheet>

      <aaa/>

      <rrr>
            <ccc  y="222"/>
      </rrr>

      <xxx>
            <available-1>true</available-1>
            <available-2>false</available-2>
            <rrr>
                  <ccc  y="222"/>
            </rrr>
      </xxx>