Quote:
Originally Posted by JSWolf
The stuff Calibre puts in is only valid for use with Calibre. So really, it belongs in the other OPF. Not the ePub's.
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I don't believe this is true. I've used both Mantano and Coolreader apps on my Android phone. Both of them understand the Series and series_index fields, which I believe are Calibre-specific opf metadata fields.