I add my 2 cents to the thread. The semantic has another feature: if you give information to the computer of the /datas/ the ebook has got inside, you can query the /datas/ to create new sections of the book itself. For example: if you use <cite> instead <i>, you could create an interactive bibliography simply querying all the <cite> used inside the ebook.
I'm not sure that the epub:type semantic is so rich like Kevinh said. It seems to me the epub:type adds semantic of the structure of the book, not for the information the book is talking about; for example I don't know if I can use epub:type to say: "this is a name of a soldier who fight in a battle", "this is a history battle", "this is the year when this battle happened". I think microdata could be a more useful semantic tool for EPUB3.
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