Are you familiar with 'Tiger Tiger' from Alfred Bester? Try to do that with your restrictive semantic only schema. It cannot be done and this is just an example. To say 'just use PDF' is not an answer, but a problem in itself. What is letting you to use hard semantics in ePUB already? Do you really think readers are interested if the book is semantically correct? They don't. Most are not interested in most metadata. The writer and title is usually enough, and perhaps genre. Series is a miss in the Dublin Core, but this is not the fault of the ePUB format at all. If YOU want more metadata, you are free to add it to an ePUB. There are no real restrictions there. A publisher is also not interested in the metadata.
I just cannot imagine why you propose another format to solve issues that are not there. If almost nobody sees it as an issue, it will not fly. There were more than enough examples of that in the past, DocBook one of the more known of them.
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