[docs] [issue33187] Document ElementInclude (XInclude) support in ElementTree

[Sanyam Khurana]

Sanyam Khurana <sanyam.khurana01 at gmail.com> added the comment:

Hello Anjali,

This PR is still lurking for your updates from almost 11 months. Please let us know if you're still working on this, else, we'll get this in.

Thanks for your work!

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33187>
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