Quote:
Originally Posted by davidfor
The "opf:scheme" describes how the identifier is used.
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Yeah, according to
http://idpf.github.io/epub-registries/identifiers there are a number scheme attributes (like DOI, ISBN, JDCN, UUID) but it seem they are usually are omitted at least in the ones I've check recently. ISBN seem to be default when it's undefined which should in this case work as the fallback type.