Implicit templates for text nodes

      <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>
                        <xsl:apply-templates  select="bbb/text()"/>
                  </xxx>
                  <yyy>
                        <xsl:apply-templates  select="ccc/text()"/>
                  </yyy>
            </xsl:template>

            <xsl:template  match="bbb/text()">
                  <BBB>
                        <xsl:value-of  select="string(.)"/>
                  </BBB>
            </xsl:template>

      </xsl:stylesheet>

      <aaa>
            <bbb>BBB</bbb>
            <ccc>CCC</ccc>
      </aaa>

      <xxx>
            <BBB>BBB</BBB>
      </xxx>
      <yyy>CCC</yyy>