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I've no idea, to be perfectly frank. Adding the xml file was the only thing I ever knew that had to be done for iBooks. This is the first I've heard of the opf metadata entry. It wouldn't be the first time they required non-standard stuff that won't pass IDPF validation, though.
That meta entry looks like it belongs in an EPUB3 to me, not and EPUB2 - which is what your epub appears to be.
Maybe someone who groks iBooks will have a better idea.
Last edited by DiapDealer; 09-30-2016 at 02:33 PM.
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