XSL Grouping Trouble

Hi,

  I have this xml and xsl below.  Right now its grouping ok.

I am just struck with one small problem

79-31-15

79 = chapter
31 = section
15 = unit

right now grouping is happening combined[79-31-15]

how about grouping just based on chapter and section[79-31] and
not including 15

how do i make this happen?


XML Content
=============

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="toc.xsl" type="text/xsl"?>
<TABLE>
 <TBODY>
  <ROW>
   <ENTRY>
    <PARA>=MISSING</PARA>
   </ENTRY>
   <ENTRY>
    <PARA>79-31-15</PARA>
   </ENTRY>
   <ENTRY>
    <PARA/>
   </ENTRY>
  </ROW>
  <ROW>
   <ENTRY>
    <PARA>=MISSING</PARA>
   </ENTRY>
   <ENTRY>
    <PARA>79-31-16</PARA>
   </ENTRY>
   <ENTRY>
    <PARA>01</PARA>
   </ENTRY>
  </ROW>
  <ROW>
   <ENTRY>
    <PARA>=MISSING</PARA>
   </ENTRY>
   <ENTRY>
    <PARA>79-32-40</PARA>
   </ENTRY>
   <ENTRY>
    <PARA>01</PARA>
   </ENTRY>
  </ROW>
 </TBODY>
</TABLE>

XSL Content
=========
<xsl:stylesheet version='1.0'
xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>
<xsl:output method='xml' encoding='UTF-8' media-type='text/xml'
indent='yes'/>

<!-- ############################################################ -->
<xsl:key name='CHAPTER' match='ROW' use='(ENTRY/PARA)[2]'/>
<!-- ############################################################ -->
<xsl:template match='/'>

<xsl:for-each
select="/TABLE/TBODY/ROW[generate-id(.)=generate-id(key('CHAPTER',(ENTRY/PAR
A)[2]))]">
 <xsl:sort select='(ENTRY/PARA)[2]' order='ascending' data-type='text'/>

<h1>Section <xsl:value-of select='position()'/></h1>
<table border='1'>
<tr><td>Subject</td><td>Chapter Section</td><td>fig</td></tr>
 <xsl:for-each select='key("CHAPTER",(ENTRY/PARA)[2])'>
  <tr>
  <xsl:for-each select='ENTRY/PARA'>
   <td><xsl:value-of select='.'/></td>
  </xsl:for-each>
  </tr>
 </xsl:for-each>
</table>
</xsl:for-each>
</xsl:template>
<!-- ############################################################ -->
</xsl:stylesheet>



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