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[xsl] Tabluation via XSLT.

From: Furry Pop <furrypop@--------->
To:
Date: 4/4/2007 8:55:00 AM
Hi,
 
I've got an XML document that I wish to convert into
an HTML table.  It requires further transformation by
some third party XSL libraries, which I will include
in my XSLT and call their templates with modes to do
their clever stuff.
 
My approach so far has been rather procedural, and I
have had to use variables, etc to maintain state.  For
instance, I use a key to remove duplicates from the
items to form the column headings and then cycle
through each row, matching against the XML via the
key.  Each row is sorted in order to keep it aligned
with the column headings. The problem with this is
that, particularly with the column headers, I lose
sight of the original XML structure, thereby
preventing me from applying further templates and
using the mode functionality.
 
Is there a more declarative approach to this
processing wherein I can build the column headings
without using variables and then populate each row in
the knowledge that the appropriate item is being
inserted into the appropriate column?  I'm thinking of
some better use of apply-templates or some clever
recursion but I can't see how to do it.
 
A much simplified version of source file and my sample
XSLT look something like the following:-
 
SOURCE FILE:-
[code]
<?xml version="1.0" encoding="UTF-8"?>
<container>
 <item>
  <value name="arthur">
   <item>
    <value rating="X" name="joyce"/>
    <value rating="W" name="ida"/>
   </item>
  </value>
 </item>
 <item>
  <value name="bertrand">
   <item>
    <value rating="Y" name="ida"/>
   </item>
  </value>
 </item>
 <item>
  <value name="colin">
   <item>
    <value rating="Z" name="joyce"/>
   </item>
  </value>
 </item>
 <item>
  <value name="derek">
   <item>
    <value rating="X" name="joyce"/>
   </item>
  </value>
 </item>
 <item>
  <value name="edward">
   <item>
    <value rating="Y" name="hilda"/>
    <value rating="W" name="joyce"/>
   </item>
  </value>
 </item>
 <item>
  <value name="frederick">
   <item>
    <value rating="Z" name="ida"/>
   </item>
  </value>
 </item>
</container>
[/code]
 
XSLT:-
[code]
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:fo="http://www.w3.org/1999/XSL/Format">
 <xsl:output method="html"/>
 <xsl:key name="distinct-col"
match="container/item/value/item/value/@name"
use="."/>
 <!-- store unique (ie "distinct") column headings for
use later-->
 <xsl:variable name="cols"
select="container/item/value/item/value/@name[generate-id()=generate-id(key('distinct-col',.))]"/>
 <xsl:template match="/">
  <html>
   <head>
    <title>TEST CODE FOR TABULATION</title>
   </head>
   <body>
    <table>
     <tr>
      <td class="rowtitle" />
      <!-- set the column headings -->
      <xsl:for-each select="$cols">
       <xsl:sort/>
       <td class="coltitle">
        <xsl:value-of select="."/>
       </td>
      </xsl:for-each>
     </tr>
     <!-- create the rows -->
     <xsl:apply-templates
select="container/item/value">
      <xsl:sort/>
     </xsl:apply-templates>
    </table>
   </body>
  </html>
 </xsl:template>
 <xsl:template match="container/item/value">
  <tr>
   <td class="rowtitle">
    <xsl:value-of select=".//@name"/>
   </td>
   <!-- squirrel away the tree of ratings under the
row currently being processed -->
   <xsl:variable name="col_rating"
select="item/value"/>
   <!-- display the rating for each col (the latter
sorted in line with the column headings above) -->
   <xsl:for-each select="$cols">
    <xsl:sort/>
    <td>
     <!-- squirrel away the col currently being viewed
-->
     <xsl:variable name="current_col" select="."/>
     <!-- only choose the ratings where it exists
against the row currently being processed -->
     <xsl:for-each select="$col_rating">
      <xsl:choose>
       <xsl:when test=".//@name=$current_col">
        <xsl:value-of select=".//@rating"/>
       </xsl:when>
      </xsl:choose>
     </xsl:for-each>
    </td>
   </xsl:for-each>
  </tr>
 </xsl:template>
</xsl:stylesheet>
[/code]
 
Thanks for any help,
 
J.
 
XSL Processor = Altova XMLSpy 2007 Professional

________________________________________________ 
F.Pop Esq is currently trading under the moniker 
-> DRAWING PIN <-
http://drawingpin.iuma.com 

Always trying to pin me down. 
Why a title for your sound?




		
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