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Re: [xsl] grouping based on string but with child nodes

Subject: Re: [xsl] grouping based on string but with child nodes
From: "James Cummings" <cummings.james@xxxxxxxxx>
Date: Mon, 13 Oct 2008 17:12:41 +0100

Hey! that seems to work.  Thanks also to the other suggestions (and as
always David and Mike).  I thought I had the idea of how to do it
right, it was remembering (how) to use  analyze-string properly that I
was having as a monday-afternoon mental block.

Just to make sure I'm understanding it, a couple questions
interspersed below with my understanding of what it does.

On Mon, Oct 13, 2008 at 16:40, G. Ken Holman
<gkholman@xxxxxxxxxxxxxxxxxxxx> wrote:
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>                xmlns:dummy="urn:x-Dummy"
>                exclude-result-prefixes="dummy"
>                version="2.0">

Sticking stuff into a dummy namespace, but really I could use the
namespace of the intended output couldn't I?

> <xsl:output indent="yes"/>
> <xsl:template match="@*|node()"><!--identity for all other nodes-->
>  <xsl:copy>
>    <xsl:apply-templates select="@*|node()"/>
>  </xsl:copy>
> </xsl:template>

 Yup, copy everything we don't match below, makes sense...

> <xsl:template match="title">
>  <xsl:variable name="separated-titles" as="node()*">
>    <xsl:apply-templates mode="separate-titles"/>
>  </xsl:variable>

Make a variable called separated-titles which uses a mode to apply the
appropriate templates below.  Does one need to cast it as node()*? I
almost never do this, I guess I'm  a bit sloppy with typing of things

>  <xsl:variable name="titles" as="element(title)*">
>    <xsl:for-each-group select="$separated-titles"
>                        group-starting-with="dummy:dummy">
>      <title>
>        <xsl:copy-of select="current-group()[not(self::dummy:dummy)]"/>
>      </title>
>    </xsl:for-each-group>
>  </xsl:variable>
>  <xsl:copy-of select="$titles"/>
> </xsl:template>

Make a variable that does a for-each-group, here cast as
element(title)* which I'm not sure I understand but I'm guessing means
that the output of the variable is required to be zero-or-more title
elements? grouping with groups starting with the dummy:dummy element
maybe before.  And the content is to copy the entire thing but exclude
from that copy the very dummy:dummy that you're grouping by.  nifty!

> <xsl:template match="*" mode="separate-titles">
>  <xsl:copy-of select="."/>
> </xsl:template>

Copy everything in separate-titles mode.

> <xsl:template match="text()" mode="separate-titles">
>  <xsl:analyze-string select="." regex="\|\|">
>    <xsl:matching-substring>
>      <dummy:dummy/>
>    </xsl:matching-substring>
>    <xsl:non-matching-substring>
>      <xsl:value-of select="."/>
>    </xsl:non-matching-substring>
>  </xsl:analyze-string>
> </xsl:template>

For every text node inside a title (since this is
mode="separate-titles") use analyze-string to find every escaped ||,
which is fine because we're just handling the text nodes.  In this if
it matches put out the dummy:dummy element we strip out later above,
and if it doesn't match then just put out the text.

Cool. I actually think I understand that at the moment.  Must remember
to use analyze-string on text nodes more....

Many thanks,


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