[xsl] Converting a Table of Contents to an index

[Jim Freeman <jim at jamesfreeman dot com>]

I am trying to invert a tree - specifically to create an index for a 
document by pulling the leaves to the top and grouping them.  A classic 
problem that I am just having a mental block on . . . ARGHHHH!!!

I won't begin to include all the XSL attempts - but will include the source 
and target . . . .

Here is the source XML:

<?xml version="1.0" encoding="UTF-8"?>
<book>
         <chapter title="Chapter 1">
                 <para>
                         <text>This is a trip overview</text>
                         <index>travel</index>
                         <index>overview</index>
                 </para>
                 <para>
                         <text>This is about planning</text>
                         <index>travel</index>
                         <index>planning</index>
                 </para>
                 <para>
                         <text>This is about packing</text>
                         <index>travel</index>
                         <index>packing</index>
                 </para>
         </chapter>
         <chapter title="Chapter 2">
                 <para>
                         <text>This is about travel in europe</text>
                         <index>europe</index>
                         <index>travel</index>
                 </para>
         </chapter>
</book>

And here is the output XML:

<?xml version="1.0" encoding="UTF-8"?>
<index>
         <entry>
                 <text>travel</text>
                 <referenceChapter name="Chapter 1">
                         <referencePara>1</referencePara>
                         <referencePara>2</referencePara>
                         <referencePara>3</referencePara>
                 </referenceChapter>
                 <referenceChapter name="Chapter 2">
                         <referencePara>1</referencePara>
                 </referenceChapter>
         </entry>
         <entry>
                 <text>overview</text>
                 <referenceChapter name="Chapter 1">
                         <referencePara>1</referencePara>
                 </referenceChapter>
         </entry>
         <entry>
                 <text>planning</text>
                 <referenceChapter name="Chapter 1">
                         <referencePara>1</referencePara>
                 </referenceChapter>
         </entry>
         <entry>
                 <text>packing</text>
                 <referenceChapter name="Chapter 1">
                         <referencePara>3</referencePara>
                 </referenceChapter>
                 <entry>
                         <text>europe</text>
                         <referenceChapter name="Chapter 2">
                                 <referencePara>1</referencePara>
                         </referenceChapter>
                 </entry>
         </entry>
</index>


















James C. Freeman
mailto:jim@jamesfreeman.com
Voice: 415 971 6541
Fax: 413 622 8955


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