: Re: Is epub 3 meant to replace epub 2? Will EPUB 2 remain an active standard now that EPUB 3 is out? More specifically: Should all new EPUB development use EPUB 3 regardless of the target platform

@Ted

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We've been creating epub 3.0 files for almost 2 years where I work. Those files have been sold through all the major retailers (though Kobo apparently stopped accepting epub 3.0 at some point a few months back, at least through Kobo Writing Life. That may have changed). As others have noted, the only thing you need to do if you want to read epub 3.0 files on an older device is include a little extra data--in particular, the toc.ncx file (which specifies the table of contents in epub 2.0.1) needs to be included in addition to the toc.xhtml file (which does the same job in epub 3.0). All of the other new markup in epub 3.0 will be happily ignored by older reading systems.

Long story short, there's no reason not to produce files in epub 3.0--it offers some neat new features (like much more comprehensive semantic markup with epub:type), and as more reading systems move to support it, you'll see a progressive enhancement of your book as those cool new features get utilized.

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