[geek1011]

Thanks for the info, @jackie_w, @NiLuJe.

Originally Posted by NiLuJe

There's a fair bit of ePub 3.something OPF features supported: https://github.com/kovidgoyal/calibr...tadata/opf3.py

I can definitely vouch for the Cover & Series stuff, since that was what I double-checked the last time I looked at this ;p.

I seem to have been a bit behind on this (the last time I did anything major with Calibre was in 2016). See 7e1d8a9 and the Debian package I was using from stretch.

I guess most ebooks I've seen which were created/modified with Calibre were EPUB2 (either actually EPUB2 or a book which declared a EPUB3 books as EPUB2 for ... reasons), so it didn't write/read those.

I should probably take another look at Calibre sometime soon to have a better idea of its current state and to get familiar with how it currently works.

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I'll have subtitle support (calibre #subtitle column, EPUB3 refined title) finished by next week at the latest (first, I'm going to finish my work on NickelHook).