MobileRead Forums - View Single Post - Incorporating NCX file into Epub3 book for backward compatibility

tbrosz · 02-28-2019, 03:16 PM

I am getting requests for Epub3 files that still have an NCX file for backward compatibility. I am converting from original .docx files, with a simple hyperlink TOC added for in-book use. The converter uses "Heading1" and other signals to build the actual Epub3 TOC in the nav.xhtml file.

While the Epub3 conversion works well except for some minor after-conversion .xhtml edits needed, there doesn't seem to be any conversion option to seamlessly add an additional NCX file during the conversion process.

I can tack an NCX file into the book using the TOC editor, but EpubCheck 4.1.1 has problems with it, and it reads in the Calibre viewer as two consecutive TOCs.

Could the Calibre converter maybe add an option somewhere for "add NCX file to Epub3 for backward compatibility?" Or is there already one somewhere I've missed, like a plug-in?

02-28-2019, 03:16 PM	#1
tbrosz Member Posts: 15 Karma: 50 Join Date: Aug 2012 Device: Kindle keyboard	Incorporating NCX file into Epub3 book for backward compatibility I am getting requests for Epub3 files that still have an NCX file for backward compatibility. I am converting from original .docx files, with a simple hyperlink TOC added for in-book use. The converter uses "Heading1" and other signals to build the actual Epub3 TOC in the nav.xhtml file. While the Epub3 conversion works well except for some minor after-conversion .xhtml edits needed, there doesn't seem to be any conversion option to seamlessly add an additional NCX file during the conversion process. I can tack an NCX file into the book using the TOC editor, but EpubCheck 4.1.1 has problems with it, and it reads in the Calibre viewer as two consecutive TOCs. Could the Calibre converter maybe add an option somewhere for "add NCX file to Epub3 for backward compatibility?" Or is there already one somewhere I've missed, like a plug-in?