Quote:
Originally Posted by jhowell
An EPUB 3 navigation document is to allowed to be part of the spine of the book.
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In many commercial epub3 fiction books, the navigation document is indeed also the TOC.
However, since
epub3 landmarks can only refer to spine items, it's not possible to link a TOC landmarks item to a navigation document that is not in the spine.
To test this, create a blank epub3 book with Sigil, manually delete
Code:
<itemref idref="nav.xhtml" linear="no"/>
from the spine and then run EPUBCheck.
This will trigger the following error message:
Code:
ERROR(RSC-011) nav.xhtml: Found a reference to a resource that is not a spine item.