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

  <stx:template match="/root">
    <stx:copy>
      <stx:variable name="var1" select="1+2"/>
      <stx:value-of select="$var1 + 2"/>
      <stx:text>:</stx:text>
      <stx:variable name="var2">
	<stx:text>is </stx:text>
	<stx:value-of select="name()"/>
      </stx:variable>
      <text>
	<stx:value-of select="concat('name ',$var2)"/>
      </text>
    </stx:copy>
  </stx:template>
  
</stx:transform>