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

Subject: Re: [xsl] looping problem, <xsl: for-each>??
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 09 Oct 2003 16:36:41 -0400

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"
<xsl:output method="xml" version="1.0"
encoding="UTF-8" indent="yes"/>

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

    <xsl:if test="name(preceding-sibling::*[1]) =
        <xsl:value-of select="preceding-sibling::*[1]" />
    ITEM<xsl:value-of select="position()"/>
<xsl:value-of select="."/>


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>

    select="xalan:nodeset($treeFrag)/rootelem" mode="treefrag">

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

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).


====================================================================== Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx Mulberry Technologies, Inc. 17 West Jefferson Street Direct Phone: 301/315-9635 Suite 207 Phone: 301/315-9631 Rockville, MD 20850 Fax: 301/315-8285 ---------------------------------------------------------------------- Mulberry Technologies: A Consultancy Specializing in SGML and XML ======================================================================

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