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Actually, the metadata support in ePUB2 is quite good. The only thing that I am really missing is the option for series metadata. I know Calibre uses a custom metadata field, but it is not in the official specs.
The main problem is not the allowable metadata, but the reluctance by publishers to actually use it. The fields that are there, are mostly used by the library programs and not by the readers. The readers usually only support what they think the most useful are.
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