Namespace creation

      <xsl:stylesheet
                  xmlns:r="rrrrrr"
                  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">
                  <r:aaa>
                        <xsl:namespace  name="s">ssssss</xsl:namespace>
                        <xxx>
                              <xsl:namespace  name="{substring-before(.,':')}"
                                          select="substring-after(.,':')"/>
                        </xxx>
                  </r:aaa>
            </xsl:template>

      </xsl:stylesheet>

      <aaa>y:yyyyyy</aaa>

      <r:aaa
                  xmlns:r="rrrrrr"
                  xmlns:s="ssssss">
            <xxx
                        xmlns:y="yyyyyy"/>
      </r:aaa>