I understand that some books may contain multi-language content, but can someone explain what is gained (or hoped to be gained) by putting a dc:language entry in the OPF for each language that appears in the book, rather than just the single primary language entry?
If dictionary look-ups are what the eventual goal is, I was under the impression that was better achieved by adding spans around different language sections in the (x)html with the proper "lang" attribute defined.
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