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When it comes to opf tag attributes, is there any logic built-in to exclude the stuff from a version 3 opf that isn't valid in a version 2 opf?
I know an un-influenced re-creation of the original source has always been (and should be) a higher priority than epub spec adherence, so perhaps it would make more sense if some of these epub3-only properties/attributes could be used to enhance the new auto-detection feature? Last time I checked, it seemed auto-detect only checked for the presence of a couple of fixed-layout properties to make its decision.
I have no idea what it might entail, but I'd like to see a more robust (possibly even heuristic) approach to ensure that the same sort of source that went in is coming back out (if auto-detect is selected).
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