Quote:
Originally Posted by Toxaris
Be aware that some metadata is mandatory. Omitting that will ensure the ePUB is not valid. It might still work, but no garantuee.
From the top of my mind, the following is mandatory: Author, Title, Language, Date and an identifier.
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Author is not mandatory since it may not be known. Should be present if known. Similarly the date is not required for the same reason. Title, Language, and unique identifier are required.