I would add: Language and rights to the meta tags. language=en and rights="public domain" (this is the ePUB name for license). There should also be a unique identifier, ISBN or equivalent. id="xxxxx". A personal favorite of mine is the description. This is a short description of the eBook. It is often used by dealer to describe the book and can be viewed in some reader programs before opening the book. The metadata wiki article has some ideas. DublinCore has the official name for terms. You may want to conform.
You might want to make the latest revision machine readable by pulling it out of the comment.
Dale
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