Quote:
Originally Posted by DiapDealer
Because the NCX isn't required in an EPUB3 and the NAV document is. But because we think backward compatibility IS important, there's also an EPUB3-only tool to generate the NCX from the current NAV document.
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I think ePub 3 that uses no features specific to ePub 3 (that cannot be done in ePub 2) should be made as ePub 2.