[xsl] Grouping and Numbering

Subject: [xsl] Grouping and Numbering
From: "Carl Radley" <Carl.Radley@xxxxxxxxxxx>
Date: Fri, 25 May 2007 10:20:34 +0100
I'm using XSLT version 1, so can't use grouping.

I need to run through a large structure that resembles:

Firstly, I need to sort the data into <group_id> order, so I use:
<xsl:apply-templates select="sample//result/details">
    <xsl:sort select="group_id" data-type="number" />

Next, within the called template, I need to loop through all the <details> and
add row numbering information but add an extra row at the end of each group.
So hope to see:
<output row="1">250</output>
<output row="2">250</output>
<output row="3" />
<output row="4">300</output>

First problem is that, when I check "preceding::details[1]/group_id" it refers
to the original document layout and not the sorted order, so I get:
<output row="1">250</output>
<output row="2" />
<output row="3">250</output>
<output row="4" />
<output row="5">300</output>

Second problem is remembering the row count, since I need to add several
additional rows during the loop, so "position()" goes out of sync.
I've tried to call another template, passing in the <group_id> and determine
it's sorted position but have not been able to get a unique list because of my
first problem.

Hope I've made this as concise as possible.
Thanks in advance,

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