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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: "Andrew Welch" <andrew.j.welch@xxxxxxxxx>
Date: Mon, 13 Oct 2008 16:17:57 +0100

2008/10/13 James Cummings <cummings.james@xxxxxxxxx>:
> Hiya,
>
> I have some old EAD XML that I'm trying to convert to a slightly
> better form and what I want to take is something like this:
>
> <unittitle>
>    <title>Calendarial rules. Prognostics. || Alcuin,
>        <emph render="italic">Quaestiones in Genesim</emph>. ||
>        Glossaries. || <emph render="italic">Ps</emph>.-Cicero,
>        <emph render="italic">Synonyma ad Lucium Veturium</emph>, with
> added Latin-Old English
>        glossaries extracted from the Grammar and Glossary of Flfric.
>    </title>
>    <!-- other elements -->
> </unittitle>
>
> where several titles are grouped together into a single title element
> and delineated by two vertical bars || and split this into properly
> grouped elements without loss of the <emph> elements.  I'll be
> combining this with some other similarly split up data (about time
> periods of the works) into a new structure.  So desired output (in a
> variable since I then need to count them and create those other
> structures one for each of these) something like:
>
> <unittitle>
>    <title>Calendarial rules. Prognostics.</title>
>    <title>Alcuin, <emph render="italic">Quaestiones in Genesim</emph>.
</title>
>    <title>Glossaries. </title>
>    <title>
>        <emph render="italic">Ps</emph>.-Cicero,
>        <emph render="italic">Synonyma ad Lucium Veturium</emph>,
>        with added Latin-Old English glossaries extracted from the Grammar
>        and Glossary of Flfric. </title>
>    <!-- other elements -->
> </unittitle>
>
> I've been assuming that this is a two-pass problem where I have to
> replace the '||' with some empty XML element  and then group-by that
> element?  If that is the case what is the best way to replace these
> for grouping?  Or is it possible to do this all-in-one?  XSLT2
> solution obviously desired to avoid too much recursion. :-)

Yes, use 2 passes, it will help you diagnose problems in the 2nd pass
much more easily.

The first pass is an idenity transform with:

<xsl:template match="title">
  <xsl:for-each select="tokenize(., '||')>
    <title><xsl:value-of select="."/></title>

For the second pass it's not clear to me how you want to group them,
so maybe post back with an example if you need to.



--
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/


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