[docutils:feature-requests] #94 Should docutils whine about nesting simple body elements?

> Unfortunately, this is just one example of an "infinite" number of ways you can build invalid documents -- testing for all sorts of violations by custom code may seriously affect performance.

However, a [transform](https://docutils.sourceforge.io/docs/ref/transforms.html)  testing for conformance could be sensible. It may walk over the document tree and for each node check that the parent node is an instance of the well-defined, small set of allowed parent nodes.
Ideas and patches are welcome.


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**[feature-requests:#94] Should docutils whine about nesting simple body elements?**

**Status:** open
**Group:** None
**Created:** Thu Feb 09, 2023 09:55 AM UTC by Julien Palard
**Last Updated:** Tue Apr 18, 2023 11:29 AM UTC
**Owner:** nobody


Context:

[This](https://github.com/python/cpython/blob/45fa12aec8f508c224a1521cfe3ae597f1026264/Doc/tools/extensions/pyspecific.py#L149) call to `nested_parse` adds a `Paragraph` node to a `Paragraph` node,  this look forbidden by [the doc](https://docutils.sourceforge.io/docs/ref/doctree.html#body-elements), and it also look to misbehave sphinx-side, when translating the document, where we completly loose the nested paragraph once translated.

It renders properly though when **not** translated.

The linked `nested_parse` returns:

```xml
<paragraph classes="availability">
    <pending_xref refdoc="index" refdomain="std" refexplicit="True" reftarget="availability" reftype="ref" refwarn="True">
        <inline classes="xref std std-ref">
            Availability
    : 
    Unix, not Emscripten, not WASI.
    <paragraph>
        Hello world I'm the content of the "availability" directive.
```

If it's really something that should not be done, maybe some kind of warning at build time could help debugging those issues?



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