Re: [xsl] Brain Teaser

[Ronan Klyne <ronan.klyne@xxxxxxxxxxx>]

This one has turned out to be beyond me - sorry I can't help...
When you get hold of your solution, I'd like to see it....

	# r

Owens, Stephen P wrote:
> I have a problem in XSLT that I simply do not know how to solve. 
> 
> Perhaps someone smarter than me can show their stuff.
> 
> Suppose you have a document such as the following:
> 
> <root>
>    <section type="foo">
>       <a>Text 1</a>
>       <a type="bar">Mixed Content
>          <b type="foo">Text 2</b>
>          <b>Mixed Content
>               <c>Text 3</c>
>               <c type="bar">Text 4</c>
>          </b>
>       </a>
>    </section>
> </root>
> 
> The root tag can contain any number of section type tags.  Section and single letter tags a-z support the type attribute which can be any string value.
> Further suppose that the schema allows section tags to contain any single letter tag a-z. Also any single letter tag a-z may contain any combination and number of single letter tags a-z. All single letter tags support mixed content as well.
> 
> How is it possible using XSLT to convert the document to one such as the following.
> 
> <root>
>    <type name="foo">
>       <section type="foo" tag-id="001">
>          <a tag-id="002">Text 1</a>
>       </section>
>    </type>
>    <type name="bar">
>       <section tag-cont="001">
>          <a tag-cont="002">
>             <b tag-id="003">Text 2</b>
>             <b tag-id="004">Mixed Content
>                 <c>Text 3</c>
>             </b>
>          </a>
>       </section>
>    </type>
>    <type name="foo">
>       <section tag-cont="001">
>          <a tag-cont="002">
>             <b tag-cont="004">
>                 <c tag-id="005">Text 4</c>
>             </b>
>          </a>
>       </section>
>    </type>
> </root>
> 
> The idea is that wherever a tag appears with a type attribute in the source document, that tag and the tags that follow appear in a well formed structure wrapped by a "type" tag in the target document, thus whenever a new type attribute is encountered on a tag, we close everything up to a pre-determined certain stopping point somewhere before the top such as the child of root in this case, and then we re-open duplicates of everything, and continue on with the processing.
> 
> Examining the above source and target example should give you a clearer idea.  Also, for anything we re-open from the previous we tie to the previous as a continuation by adding an tag-id attribute to the original tag, and a tag-cont attribute to the subsequent continuation.
> 
> I think it is fairly trivial to write a transform that goes from the latter to the former, but I can think of no way to go from the former to the latter. 
> 
> For those of you thinking this is a trivial exercise consider the real world application of translating DocBook XML or similar schemas into XSL-FO.
> 
> Anyone out there up for a challenge?
> 
> 
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-- 
Ronan Klyne
Business Collaborator Developer
Tel: +44 (0)870 163 2555
ronan.klyne@xxxxxxxxxxx
www.groupbc.com