MobileRead Forums - View Single Post

Moonbase59 · 07-18-2025, 09:07 AM

I guess it has historical reasons. As far as I remember EPUB2 has subtitle not defined, while EPUB3 has the "refines" like "main" and "subtitle". Since Calibre has been around a long time, it might be doing it this way for compatibility reasons.

As the OP noticed, this may lead to file naming problems with long titles. Calibre shortens long parts of the path to something that is deemed Windoze-compatible, apparently.

I mostly care about EPUB3 nowadays (in spite of my Tolino Vision 5 always complaining "Opening this book can lead to errors. Do you still want to open it?").

07-18-2025, 09:07 AM	#10
Moonbase59 Addict Posts: 229 Karma: 1000244 Join Date: Oct 2021 Location: Germany Device: Tolino Vision 5, Tolino Tab 8", Pocketbook Era (16GB)	I guess it has historical reasons. As far as I remember EPUB2 has subtitle not defined, while EPUB3 has the "refines" like "main" and "subtitle". Since Calibre has been around a long time, it might be doing it this way for compatibility reasons. As the OP noticed, this may lead to file naming problems with long titles. Calibre shortens long parts of the path to something that is deemed Windoze-compatible, apparently. I mostly care about EPUB3 nowadays (in spite of my Tolino Vision 5 always complaining "Opening this book can lead to errors. Do you still want to open it?"). Last edited by Moonbase59; 07-18-2025 at 09:11 AM.