Quote:
Originally Posted by kovidgoyal
That just goes to show that those publishers don't have a clue.
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Maybe. But it is always safer to follow the specifications. If the OPF specification says that the "title", "identifier" and "language" metadata items are "required", why not include them in any EPUB file?
"Invalid" EPUBs might be accepted by the currently available EPUB readers. But there is no guarantee that they will be accepted by future readers.