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Originally Posted by bookman156
So it's an EPUB3 thing? I don't think I want to go back to EPUB2 but it explains why I never see this in those.
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Yes. The NAV document is required in EPUB3. It basically replaces the NCX that was required in EPUB2. You may not have
seen it in EPUB2, but even if you had no need of a TOC (and you never generated the NCX), it was still there--with "Start" as the only entry, no less. It's just that the NCX is typically used by EPUB2 rendering engines for navigation (it doesn't show in the epub itself). But its "Start"-only content would still be visible if they used their epub2 reader's built in navigation.