Quote:
Originally Posted by dgatwood
However, I would rather not do so unless absolutely necessary. The way I see it, EPUB 3 is almost four years old, which makes it almost half as old as EPUB 2 already. If it isn't time to adopt the standard by now, it never will be.
Of course, my EPUB 3 books do include an NCX and a guide tag in an effort to maximize compatibility with older devices, so I'm not being a purist about the newer standard by any means. 
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The main problem with EPUB 3 is that it really isn't necessary. A vast majority of the ebooks out there are effectively text copies of physical books. EPUB 2 contains everything necessary to create and distribute these ebooks.
EPUB 3 will probably never become a majorly implemented standard. Especially if EPUB 3 renderers haven't hit the mainstream after 4 years.