Re: [xsl] Grouping

["G. Ken Holman" <gkholman at CraneSoftwrights dot com>]

At 2002-01-21 06:29 -0800, Maarten Meussen wrote:
>I've been stuck on the next problem for a few days
>now, eventhough the answer must be real simple ( I
>think), I cant figure it out.

Multiple-level sorting with the pure Muenchian method involves divining a 
key combination that is unique at each level of the key sort and then 
recombining this for each node being tested.

Personally, I find that sorting sub-groups is a lot easier using variables 
instead of using key tables.

You don't give enough data to write a quick test file, but here is the 
outline of the code structure:

<xsl:variable name="firsts" select="XPath-of-first-level-sort-nodes"/>
<xsl:for-each select="$firsts">
   <xsl:if test="generate-id(.)=
                 generate-id($firsts[XPath-of-unique-value-calculation])">
     <!--first-level grouping completed-->
     <xsl:variable name="seconds" select="XPath-relative-for-seconds">
     <xsl:for-each select="$seconds">
       <xsl:if test="generate-id(.)=
                     generate-id($seconds[XPath-of-unique])">
         <!--second-level grouping completed-->
         ...etc....
       </xsl:if>
     </xsl:for-each>
   </xsl:if>
</xsl:for-each>

I hope the above helps.

................... Ken


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