Had a free moment when getting gas ... in epub "2.01" opf:scheme does exist but only for dc:identifier and not for dc:creator or dc:contrinutor as the opf:role implicitly implies the marc:relators scheme as the only scheme allowed for opf:role. That makes no sense at all but it is the epub 2.0.1 spec. It is the exact opposite for what they did for epub3 which requires the scheme used for role refines. So I will fix this when I get back and we can do a quick bugfix release of 0.9.5 since 0.9.4 has two regressions now and added a feature to allow better css validation choice.
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