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Re: looping problem, <xsl: for-each>??

2003-10-09 17:36:04
Hi Wendell,
  Thanks for the suggestions.. I would try them. 

Regards,
Mukul


--- Wendell Piez <wapiez(_at_)mulberrytech(_dot_)com> wrote:
Mukul,

Nice job with this.

At 01:05 PM 10/9/2003, you wrote:
I applied your suggestion to store an intermediate
tree fragment in a variable, and then converting
the
variable into a nodeset. By iterating the nodeset,
I
am able to generate numbers 1,2,3,4..

The XSL is --

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:xalan="http://xml.apache.org/xalan";>
<xsl:output method="xml" version="1.0"
encoding="UTF-8" indent="yes"/>

<xsl:key name="x" match="/rss/channel/item"
use="category"/>
<xsl:template match="/">
  <xsl:variable name="treeFrag">
    <rootelem>
      <xsl:for-each select="rss/channel/item">
        <xsl:if test="generate-id(.) =
generate-id(key('x',
category)[1])">
          <h1>                                    
         <xsl:value-of 
select="category"/>
          </h1>
          <xsl:for-each select="key('x',
category)">
            <desc>
              <xsl:value-of select="description"/>
            </desc>
          </xsl:for-each>
        </xsl:if>
      </xsl:for-each>
    </rootelem>
  </xsl:variable>

  <xsl:for-each
select="xalan:nodeset($treeFrag)/rootelem/desc">
    <xsl:if test="name(preceding-sibling::*[1]) =
'h1'">
      <h1>
        <xsl:value-of
select="preceding-sibling::*[1]" />
      </h1>
    </xsl:if>
    ITEM<xsl:value-of select="position()"/>
<xsl:value-of select="."/>
  </xsl:for-each>
</xsl:template>

</xsl:stylesheet>

In the above solution, though numbers are getting
generated properly, but to output <h1> tags at the
right place, I had to write a slightly complex
syntax
* xsl:if test="name(preceding-sibling::*[1]) =
'h1'" *

Yes. This could be improved by using plain old
templates to process this 
stuff, as in:

<xsl:template match="/">
   <xsl:variable name="treeFrag"> [construct as you
have 
it...]  </xsl:variable>

   <xsl:apply-templates
     select="xalan:nodeset($treeFrag)/rootelem"
mode="treefrag">
   </xsl:for-each>
</xsl:template>

<xsl:template match="item" mode="treefrag">
   ITEM<xsl:number level="any"/> <!-- I changed it
to xsl:number: more 
dependable -->
   <xsl:value-of select="."/>
</xsl:template>

<xsl:template match="h1" mode="treefrag">
   <xsl:copy-of select="."/>
</xsl:template>

This can also be generalized further to handle a
greater range of input 
structures.

I still think an XPath-based counting solution may
be possible here, but 
it's highly dependent on the structure of the input
(and hence, rather more 
brittle), and in the meantime I think I lost the
input sample (it's around 
here somewhere).

Cheers,
Wendell



======================================================================
Wendell Piez                           
mailto:wapiez(_at_)mulberrytech(_dot_)com
Mulberry Technologies, Inc.               
http://www.mulberrytech.com
17 West Jefferson Street                    Direct
Phone: 301/315-9635
Suite 207                                         
Phone: 301/315-9631
Rockville, MD  20850                                
Fax: 301/315-8285

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in SGML and XML

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