Thanks Jay. Your example gets me some way by picking the right items for the
lists (I had something like that for one of my attempts) but there are still
a couple of serious problems in my scenario that mean I can't use it:
1. The parent element of the flat structure sequence can occur in a large
number of elements e.g. section, subsection1, subsection2, p, list etc.
Since I don't know the parent (can't really code for all of them) I don't
have a nice parent node template in which to place my xsl:for-each-group
code.
2. In your example the intermingling nodes are lost on output. I need to
preserve all of these on output, and keep them in the same relative
positions.
For these two reasons I felt forced to attach my list nesting code on the
first <par class="Listbegin"> as the trigger to start the list, then try to
get the following node sequence (i.e. all list-items up to the next
non-list-item node) and close off the list.
Am I approaching this from the right angle?
A more challenging example xml might be.
<?xml version="1.0" encoding="UTF-8"?>
<Any-element>
<a>some text</a>
<par class="Listbegin">Fruit</par>
<par class="Listitem>Apple</par>
<par class="Listitem>Orange</par>
<par class="Listitem>Pear</par>
<a>more text</a>
<par class="Listbegin">Colours</par>
<par class="Listitem>Red</par>
<par class="Listitem>Green</par>
<par class="Listitem>Blue</par>
<par class="Listbegin">Shapes</par>
<par class="Listitem>Triangle</par>
<par class="Listitem>Circle</par>
<par class="Listitem>Square</par>
<a>yet more text</a>
</Any-element>
to produce
<?xml version="1.0" encoding="UTF-8"?>
<data>
<a>some text</a>
<list>
<head>Fruit</head>
<item>Apple</item>
<item>Orange</item>
<item>Pear</item>
</list>
<a>more text</a>
<list>
<head>Colours</head>
<item>Red</item>
<item>Green</item>
<item>Blue</item>
</list>
<list>
<head>Shapes</head>
<item>Triangle</item>
<item>Circle</item>
<item>Square</item>
</list>
<a>yet more text</a>
</data>
Any more pearls of wisdom on the appreciated!
Derek
-----Original Message-----
From: JBryant(_at_)s-s-t(_dot_)com [mailto:JBryant(_at_)s-s-t(_dot_)com]
Sent: 25 May 2005 20:30
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] xslt 2.0: grouping flat element structures to make
lists
Hi, Derek,
The trick is picking just the bits you want in the list. I took your
sample lists and made a sample XML file and a stylesheet to demonstrate
one way to do it (with apply-templates).
Here's the XML file (with non-list elements intermingled with the lists):
<?xml version="1.0" encoding="UTF-8"?>
<lists>
<par class="Listbegin">Fruit</par>
<par class="Listitem">Apple</par>
<par class="Listitem">Orange</par>
<par class="Listitem">Pear</par>
<something>thing1</something>
<something>thing2</something>
<par class="Listbegin">Colours</par>
<par class="Listitem">Red</par>
<par class="Listitem">Green</par>
<par class="Listitem">Blue</par>
</lists>
And here's the XSL:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:template match="lists">
<lists>
<xsl:for-each-group select="*"
group-starting-with="par[(_at_)class='Listbegin']">
<list>
<xsl:apply-templates
select="current-group()/self::par[(_at_)class='Listbegin']|current-
group()/self::par[(_at_)class='Listitem']"/>
</list>
</xsl:for-each-group>
</lists>
</xsl:template>
<xsl:template match="par[(_at_)class='Listbegin']">
<head><xsl:value-of select="."/></head>
</xsl:template>
<xsl:template match="par[(_at_)class='Listitem']">
<item><xsl:value-of select="."/></item>
</xsl:template>
</xsl:stylesheet>
And here's the resulting output:
<?xml version="1.0" encoding="UTF-8"?>
<lists>
<list>
<head>Fruit</head>
<item>Apple</item>
<item>Orange</item>
<item>Pear</item>
</list>
<list>
<head>Colours</head>
<item>Red</item>
<item>Green</item>
<item>Blue</item>
</list>
</lists>
Does that come near the mark or did I misunderstand?
(And this time I remembered to use the self axis. Thanks again to David
Carlisle.)
Jay Bryant
Bryant Communication Services
(presently consulting at Synergistic Solution Technologies)
"Derek Revill" <derek(_at_)revill(_dot_)demon(_dot_)co(_dot_)uk>
05/25/2005 01:07 PM
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Subject
[xsl] xslt 2.0: grouping flat element structures to make lists
Hello
Using XSLT 2.0 (running Saxon 8.4) I am grappling with a pretty standard
grouping issue, attempting to utilize some of XSLT v2 grouping
possibilities
but with no success (reading the W3C spec and a scan of the archive
haven't
proved helpful, MK book is on order!).
Mid flow I have:
..
..
<par class="Listbegin">Fruit</par>
<par class="Listitem>Apple</par>
<par class="Listitem>Orange</par>
<par class="Listitem>Pear</par>
<par class="Listbegin">Colours</par>
<par class="Listitem>Red</par>
<par class="Listitem>Green</par>
<par class="Listitem>Blue</par>
..
..
I just need to output
..
..
<list>
<head>Fruit</head>
<item>Apple</item>
<item>Orange</item>
<item>Pear</item>
</list>
<list>
<head>Colours</head>
<item>Red</item>
<item>Green</item>
<item>Blue</item>
</list>
Note: I'm midway through processing any section when I encounter the <par
class="Listbegin">. The signal that a list has ended can be any
following-sibling that isn't <par class="Listitem>..</par> or the end of
the
parent element I'm in. Of course, lists don't always come in pairs like
above.
Should I try to match on the <par class="Listbegin"> then scoop-up all
relevant following nodes, which was my strategy up to now? Haven't been
able
to find a way to scoop-up only the following nodes that are relevant.
Any advice gratefully received. Numerous attempts using for-each-group and
various group-by strategies have been fruitless, probably I just haven't
quite grasped it!
Thanks
Derek Revill
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