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Re: Problem with Muenchian grouping

2003-11-10 05:09:35
Thank you all for your replies.
However I have another problem:

Here is my XSL file:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
 <xsl:output method="html"/>
 <xsl:key name="records-by-name" match="//*[action]" use="name()"/>
 <xsl:template match="/">
  <html><head><title>Viewer</title></head><body bgColor="white">
  <xsl:for-each select="//*[generate-id(.) =
generate-id(key('records-by-name',name())[1])]" >
   <xsl:sort select="name()" />
   <h3><b><xsl:value-of select="name()"/> table</b></h3>
   <table border="1" cellpadding="5" borderColor="black">
   <thead>
   <th align="center" bgColor="lightgrey">Selection</th>
   <xsl:for-each select="./*">
    <th align="center" bgColor="lightgrey"><xsl:value-of select="name()"/>
</th>
   </xsl:for-each>
   </thead>
   <xsl:for-each select="key('records-by-name',name())">
    <tr>
    <td align="center"><input type="checkbox" checked="true"/></td>
    <xsl:for-each select="./*">
     <xsl:choose>
      <xsl:when test="string-length(text()) &lt; 1"><td><i>empty
record</i></td></xsl:when>
      <xsl:when test="text()='update'"><td align="center"
bgColor="dodgerblue"><xsl:value-of select="text()"/></td></xsl:when>
      <xsl:when test="text()='insert'"><td align="center"
bgColor="limegreen"><xsl:value-of select="text()"/></td></xsl:when>
      <xsl:when test="text()='delete'"><td align="center"
bgColor="mediumorchid"><xsl:value-of select="text()"/></td></xsl:when>
      <xsl:otherwise><td align="center"><xsl:value-of
select="text()"/></td></xsl:otherwise>
     </xsl:choose>
    </xsl:for-each>
    </tr>
   </xsl:for-each>
   </table><br/><br/>
  </xsl:for-each>
  </body></html>
 </xsl:template>
</xsl:stylesheet>

I group elements that have an <action> child by name and then for each group I
build an HTML table. Members of the same group usually have the same set of
childnodes, but this is not always the case, and this is a problem, given the
way I build the tables: I get the first member of the group and set the
headers of the table to the names of its children (<th align="center"
bgColor="lightgrey"><xsl:value-of select="name()"/> </th>). When other members
of the group have more children, the values of those latter are put in a new
column without header...

So, instead of getting the first member of the group, I would like to get the
one with the greatest number of children (to get all the headers, it's not a
problem if some fields are blank in the table). Is this possible?

Wendell Piez a écrit :

Jean,

At 12:29 PM 11/7/2003, you wrote:

I'm interested in the children of <data> that have an <action> child: I
would like to group them by name and perform some processing on them.
The problem is I cannot know those names (that is, each element is
optional), and the number of elements of each category is undefined.
So I don't know how to define the <xsl:key> element that I need.
I have tried <xsl:key name="records-by-name" match="/*/*[action]"
use="name()"> but that doesn't seem to work.

I'd suggest

<xsl:key name="records-by-name" match="*[action]" use="local-name()"/>

This is different from yours in that:
- it matches any element with an action child, not just those directly
below the top level
- it uses the local-name() function, as a precaution against namespace
confusion. (Though name() should work and you don't have to change this.)

The first fix is what will help in your case, since the elements you want
(judging from your sample data) are three levels below the root, not two
(for example, /dump/data/project), and hence won't match "/*/*[action]".

Nor can I identify the elements appearing first in their "group":
my_element_name[generate-id(.) = generate-id(key('records-by-name',
name())[1])] because precisely I don't know what to put instead of
"my_element_name".

Just *[generate-id(.) = generate-id(key('records-by-name', name())[1])] --
this matches any element on the child axis.

 I think there is a problem in the way I want to reach
the name (the tag name) of those /*/*[action] nodes. But when I replace
'name()' by 'self::name()' it raises an error (isn't 'self' a correct
axis?).

self:: is an axis, but name() is a function, not a node test, so
self::name() is illegal.

I hope this is enough to get you back on track--

Cheers,
Wendell

In fact I have mostly tried to adapt the example given by Dr Jenni
Tennison in the "Cocoon, sql and xslt" thread, but in my case, the
grouping is done depending on the names of the elements I want to group,
not on their children's values.

I hope my question is clear.

Thanks in advance,

Jean


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Wendell Piez                            
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Mulberry Technologies, Inc.                http://www.mulberrytech.com
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