Originally Posted by fjtorres
ePub3 brings a lot of useful stuff (and a few nasty surprises) and is going to be the core format internal to the BPHs, but there literally is nothing to prevent retailers (or other publishers) from embracing and extending it to serve their specific agendas, especially in asia and other protectionist markets.
Let a thousand (incompatible) epubs bloom.
This is what lack of enforcement brings.
Apple do not claim that the files that iBooks Author produces are "ePub" files. There's nothing to enforce.
Storm, meet teacup.