I
want EPub 3 files that contain NCX for backwards compatibility. That is allowed in the format, but not required. In the
O'Reilly book EPub 3 Best Practices, the authors say:
Quote:
|
In order to enable an EPUB 3 to be rendered by an EPUB 2 reading system, it has to include an NCX even though it also has to have a nav to conform to EPUB 3. Until EPUB 2 reading systems have become obsolete (no sign of that in the near future), publishers generally need to include both.
|
It's fine to tell me that getting this automatically included in conversions isn't currently possible in Calibre. I haven't been able to find an option to enable it - but there are a lot of places to find options...