Quote:
Originally Posted by Notjohn
That's not what Hitch just said!
Or what I understood her to say: that an epub is an epub is an epub, regardless of whether Amazon sells it as such.
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The purpose of an ISBN is to identify a specific version of a book; that's why hardbacks and paperback editions of the same book have different ISBNs, although they contain the same text. Similarly different formats of the same ebook should each have an unique ISBN, even if their contents are the same.
Of course, many authors don't do this, but that is the way the ISBN system is intended to work.