I am learning to produce epub files using sigil, and I am working on a file of format epub3. I want the defined a epub file so that bookmarks are generated when viewed by, say, Okular.
I have tried all I can but the file defined just go with bookmarks. I have compared files thoroughly with the .epub downloaded from
https://www.mobileread.com/forums/sh...82&postcount=8.
I have studied the downloaded file and found:
- the bookmarks is generated from `toc.ncx` instead of `nav.xhtml`
- the bookmarks of my working file is generated from the guide section of content.opf
- The only difference I can find is that the downloaded file is opened by epub3.0-Sigil[std] and my working file epub3.0-Sigil
A further question, is it possible to generate bookmarks from nav.xhtml, as toc.ncx is not needed for a epub3 file?