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Ad 1: yes
Ad 2: yes
Ad 3: not by default. There are more. The Dublin Core is used. Check that for full specs. You can also check the IDPF site for the official ePUB specs. I would advise the ePUB2 version, as that one is generally used.
Ad 4: no, that is not required. Only author, title and language are hard required.
Be aware that it is a special zip file. Packing must be done according to certain rules, or the result will no longer be an ePUB file.
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