With music its easy. You just have to be able to listen to it. With books there are soooo many variables. Screensizes, fonts, special designs, chapters, parts and other structures, bookmarks, annotations, multimedia and lots more.
I hope there will be something that can call itself a real standard in te near future. the basic parts from the idpf standards are all quite well. But there is still some structural standard for bookcontent missing.
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