I wonder, what would be the simplest way to transform a sequence
of sibling nodes, e. g.:
<body>
<h1>Chapter</h1>
<h2>Section</h2>
<h3>Subsection</h3>
<h3>Another subsection</h3>
<h2>Another section</h2>
</body>
into a nested list, like:
<body>
<ul>
<li>Chapter
<ul>
<li>Section
<ul>
<li>Subsection</li>
<li>Another subsection</li>
</ul>
</li>
<li>Another section</li>
</ul>
</li>
</ul>
</body>
in XSLT 1.0?
The following conditions are assumed to be true:
* all the `hN' nodes are the children of a single `body' node;
* for any consequent elements `hN' and `hM', M <= 1 + N; the
first child of the `body' node is `h1'; i. e., it's assumed
that, e. g., the following input could never happen:
<body>
<h1>Foo</h1>
<h3>Bar</h3>
</body>
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