Quote:
Originally Posted by philja
I thought they must be required in order to indicate no pages.
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It's possible that they might be needed as some sort of submission prerequisite (D2D or Apple), but from an epub standards point of view, I don't believe there's a need to indicate "no pages". I could be wrong. Sigil adds them to a new ncx by default for some reason. But I can't find any indication they absolutely need to be there for reading systems to properly handle page-less epubs.