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

  <stx:template match="/root">
    <node>
      <stx:value-of select="round(2.5)"/>
      <stx:text>:</stx:text>
      <stx:value-of select="round(2.4999)"/>
      <stx:text>:</stx:text>
      <stx:value-of select="round(-2.5)"/>
      <stx:text>/</stx:text>
      <stx:value-of select="floor(10.5)"/>
      <stx:text>:</stx:text>
      <stx:value-of select="floor(-10.5)"/>
      <stx:text>/</stx:text>
      <stx:value-of select="ceiling(10.5)"/>
      <stx:text>:</stx:text>
      <stx:value-of select="ceiling(-10.5)"/>
    </node>
  </stx:template>

</stx:transform>