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

[Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>]

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


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Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
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Suite 207                                          Phone: 301/315-9631
Rockville, MD  20850                                 Fax: 301/315-8285
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