My 2 cents here:
All of these seem correct.
But since refines go away under epub 3.1 metadata rules, and because the official rules of Universe Resource Name (urn:) are quite vague and do not require use of an "identifier-type", I would stick with the simplest approach for epub 3.0, using
<dc:identifier id="amazon-id">urn:AMAZON:BXXXXXXXXX</dc:identifier>
with no extra refines as parsing that urn provides all of the information needed to fully understand the identifier.
Last edited by KevinH; 07-25-2017 at 01:21 PM.
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