I don't see mobi-vs-epub standards as very important; it is trivial to publish an ebook in one or the other or both. One could argue that mobi set a standard that Amazon followed, then epub was created to have an open-source standard, but that just begs for somebody to come along with an even better open-source alternative (or new version of epub.) It will still be trivial to publish all existing e-books to the new format.
The important standards for e-books have long been in place: sentence structure, paragraphs, left-to-right reading, etc.
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