How about the brute force technique:
> From Andrew Welch
<xsl:for-each-group ...>
  <xsl:sort select="tokenize(.,'\.')[1]" data-type="number"/>
  <xsl:sort select="tokenize(.,'\.')[2]" data-type="number"/>
  <xsl:sort select="tokenize(.,'\.')[3]" data-type="number"/>
  <xsl:sort select="tokenize(.,'\.')[4]" data-type="number"/>
  <xsl:sort select="tokenize(.,'\.')[5]" data-type="number"/>
  <xsl:sort select="tokenize(.,'\.')[6]" data-type="number"/>
</xsl:for-each>

Obviously this doesn't scale well :)
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Reply:

Thanks, that could work in a pinch, but I was hoping someone could give me a more general solution.

-- 
Charles Knell
cknell@xxxxxxxxxx - email