[AlanHK]

I was working on an epub3 file.
(I know my way around epub2, but 3 I'm still stumbling.)

There wasn't a HTML contents page, and the NAV file looked OK in Sigil, so I thought I could use that.

But if I add the semantic tag "Table of contents" in Sigil, I get an error in ePubCheck:

ERROR(RSC-011): Found a reference to a resource that is not a spine item.


And when I used Calibre to view the file, the NAV file was not displayed.

I used Kindlegen to make AZW3, and it gave this error:
Warning(prcgen):W14001: Hyperlink not resolved: \OEBPS\Text\toc.xhtml
Warning(prcgen):W14002: Some hyperlinks could not be resolved.

That is certainly the location of the NAV file, as I confirmedd by opening the epub as a zip file.

However, it isn't listed in the OPF manifest section.

I gave up and copied the NAV and tagged the copy as TOC, that worked.

Can the NAV file be used as a visible Contents file or is it only an invisible system file?