Requiring metadata_prefix for ListIdentifiers, per OAI-PMH specs #105
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Per the OAI-PMH specs,
metadataPrefix
is a required argument for ListIdentifiers. As such, the code for ListIdentifiers should not just assume a default if it is not supplied. See http://www.openarchives.org/OAI/openarchivesprotocol.html#ListIdentifiersIn our use case, the values returned by a ListIdentifier call depend on the prefix because some identifiers are only valid for requesting data in certain formats.