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Originally Posted by ProDigit
I've seen books without everything, but the identifier.
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Then they will not validate. The items I mentioned are mandatory, with the exception of the author and apparently. I was sure those where mandatory too.
From the specs:
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At least one of each of Dublin Core title, identifier and language must be included in the metadata element. Dublin Core elements, like any other elements in the OPF Package Document, may have an id attribute specified. At least one Dublin Core identifier, which is referenced from the package unique-identifier attribute, must have an id specified.
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Be aware that most readers and reading applications will expect the author metadata also present. They will use that small subset to fill the internal database and will make it easier to select and read the book.