<stx:transform version="1.0" 
  xmlns:stx="http://stx.sourceforge.net/2002/ns"
  strip-space="yes">

  <stx:template match="/root">
    <stx:variable name="s">abCd0</stx:variable>
    <root>
      <stx:value-of select="upper-case($s)"/>
      <stx:text>-</stx:text>
      <stx:value-of select="lower-case($s)"/>
    </root>
  </stx:template>

</stx:transform>