Since you're looking for design patterns, in Jackson Structured Programming (
revisited using modern terminology at http://mcs.open.ac.uk/mj665/JSPDDevt.pdf
) this is known as a "boundary clash" problem, and the usual solution is to
flatten the heirarchy into a sequence of leaf nodes each containing details of
its own ancestry, and then reconstruct the new heirarchy by a grouping
operation on this sequence of leaf nodes. The original JSP book from 1975 is
quite tough going nowadays, it all rather assumes you're well versed in
sort-merge processing of hierarchical data files on magnetic tape. But the
overall philosophy of transforming hierarchies using a pipeline of successive
tree-walking transformations is isomorphic to the world we live in.
Although it's instinctive to reach for an XSLT solution, I think I once solved
a problem like this at the SAX level: keep a stack of open elements, and when
you hit a <split/>, emit endElement events to close open elements up to a
certain level, then output the <split/>, then re-open the elements that you
closed, in reverse order; you've then got a structure that's relatively easy to
break into sections using conventional grouping.
Michael Kay
Saxonica
On 10 Feb 2022, at 08:20, Matthieu Ricaud-Dussarget
ricaudm(_at_)gmail(_dot_)com
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
Dear XSL List,
It's not the first time I'm facing a splitting problem working with
publishing documents.
I used to find kind of tricky/verbose solutions but I'm wondering if I'm
missing something obvious, especially with XSLT 3.0 new features ?
My XML looks like this :
<root>
<section>
<title>Title</title>
<content>
<p>paragraph #1</p>
<p>paragraph #2 to split <split id="split-1"/> here</p>
<p>paragraph #3</p>
<p>paragraph #4 <strong> to split <split id="split-2"/> here</strong>
if possible</p>
<p>paragraph #5</p>
<ul>
<li>Item #1</li>
<li>Item #2 to split <split id="split-3"/> here</li>
<li>Item #3</li>
<li>
<ul>
<li>Item #4</li>
<li>Item #5 to <em>split <split id="split-4"/></em> here if
possible</li>
<li>Item #6</li>
</ul>
</li>
</ul>
<p>paragraph #6</p>
</content>
</section>
</root>
The goal is to split the section on every <split> element (just like a page
would break the flowing text anywhere in the structure).
Expected result :
<root>
<section>
<title>Title</title>
<content>
<p>paragraph #1</p>
<p>paragraph #2 to split</p>
</content>
</section>
<split id="split-1"/>
<section>
<title>Title</title>
<content>
<p>paragraph #3</p>
<p>paragraph #4 <strong> to split</strong></p>
</content>
</section>
<split id="split-2"/>
<section>
<title>Title</title>
<content>
<p><strong> here</strong> if possible</p>
<p>paragraph #5</p>
<ul>
<li>Item #1</li>
<li>Item #2 to split </li>
</ul>
</content>
</section>
<split id="split-3"/>
<section>
<title>Title</title>
<content>
<ul>
<li> here</li>
<li>Item #3</li>
<li>
<ul>
<li>Item #4</li>
<li>Item #5 to <em>split</em></li>
</ul>
</li>
</ul>
</content>
</section>
<split id="split-4"/>
<section>
<title>Title</title>
<content>
<ul>
<ul>
<li> here if possible</li>
</ul>
<li>Item #6</li>
</ul>
<p>paragraph #6</p>
</content>
</section>
</root>
My idea was to iterate from 1 to the number of split elements + 1 and working
on the section with tunnel params so I can test for each node if it's before
/ after / in between (current) splits elements, and then decide to keep the
node or not according to this position.
I already used this kind of solution on a similar problem, long time ago. So
I'll give it a try though I'm not not totally confident with it (because
split elements can appear as inline content here).
Please let me know if you have ideas, if my solution is the right or wrong
way to go?
Are there special design patterns for this kind of problem ?
And last, have you ever faced this kind of splitting issue, any feedback
welcome :)
Cheers,
Matthieu Ricaud-Dussarget
--
Matthieu Ricaud-Dussarget
+33 6.63.25.95.58
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