Controlled vocabularies are needed to describe the type (urn, doi, lsid, issn, purl, etc.) and the use of the Identifier (proprietary, version, alternative, etc.). For example, scheme for identifier types is defined in DataCite ontology or in DataCite Metadata Schema.
This issue has been reported by Pirjo-Leena Forsström:
http://joinup.ec.europa.eu/mailman/archives/dcat_application_profile/2015-August/000296.html
Component
DocumentationCategory
Controlled vocabulary
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Analysis: The namespace schema for ADMS http://www.w3.org/ns/adms defines the way the identifier scheme is expressed as follows: “the content string should be provided using skos:notation, datatyped with the identifier scheme”. ADMS does not identify the URI set to be used for the references to the identifier schemes, and the DataCite list could be used for this if it is considered sufficiently general.
Proposal: Add section in chapter 4 to describe adms:Identifier with mandatory property skos:notation and datatype reference from DataCite list.