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

  <stx:variable name="g1" select="1"/>

  <stx:template match="/root">
    <stx:copy>
      <stx:value-of select="$g1"/>
      <stx:text>:</stx:text>

      <stx:assign name="g1" select="2"/>
      <stx:value-of select="$g1"/>
      <stx:text>:</stx:text>

      <stx:assign name="g1">
	<stx:value-of select="'O'"/>
	<stx:text>K</stx:text>
      </stx:assign>

      <stx:value-of select="$g1"/>

      <inner>
	<stx:variable name="g1" select="'a'"/>
	<stx:value-of select="$g1"/>
	<stx:text>:</stx:text>

	<stx:assign name="g1" select="'b'"/>
	<stx:value-of select="$g1"/>
      </inner>

      <stx:value-of select="$g1"/>

    </stx:copy>
  </stx:template>
  
</stx:transform>