Supported SDF tags/features?

[sven1904]

I tried to include other SDF or URDF files within my SDF world file.
When I load the world file, there is still no error, but it seems like the content within <include> ... </include> is simply ignored.
I'm wondering if (py)Bullet supports SDF's <include> tag?

And in general, is there an overview available which SDF tags (or further features like closed loops) are supported?

Since SDF offers a quite rich feature set many developers switch(ed) from URDF to SDF.
Unfortunately (py)Bullet does not support much of the advantages yet.
Is there any plan to increase the number of supported features/tags for SDF in the next years or is the medium-term strategy to leave it as is?

Thanks in advance!