Examples
Worked examples
- Is an instance
'doi' as a scheme value alongside the identifier '10.1038/nature14539' in a metadata record.
- Is an instance
'orcid' as a scheme indicating that the accompanying identifier is an ORCID iD.
Counter-examples
Looks similar, but isn't
- Not an instance
'paper' is not an identifier scheme — it describes the entity type, not the naming system.
- Not an instance
'unique' is not an identifier scheme.
Editorial commentary
Examples of identifier schemes include DOI, Handle, ARK, ORCID, ROR, ISNI, URN, UUID. Each scheme is defined by some combination of standards documents (ISO standards, IETF RFCs, community specifications), governing bodies (DataCite, Crossref, CNRI, ORCID Inc., etc.), and operational infrastructure (registries, resolvers). When a CRIS or repository must record an identifier, declaring ‘which scheme this is’ is essential to interpretation — ‘12345’ alone is meaningless without the scheme.
References
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Also known as
PID scheme
Machine-readable encodings
Use in your systems
<role vocab="credit"
vocab-identifier="https://casrai.org/dictionary/"
vocab-term="Identifier scheme"
vocab-term-identifier="https://casrai.org/dictionary/term/identifier-scheme" />{
"@context": "https://schema.org",
"@type": "DefinedTerm",
"name": "Identifier scheme",
"identifier": "https://casrai.org/dictionary/term/identifier-scheme",
"description": "A named, formally-defined system for constructing, issuing, and resolving identifiers, typically defined by a syntax, an authority structure (who can mint), a metadata schema, and a resolution policy.",
"inDefinedTermSet": "https://casrai.org/dictionary/domain/the-persistent-identifier-ecosystem/",
"url": "https://casrai.org/dictionary/term/identifier-scheme",
"sameAs": [
"PID scheme"
],
"license": "https://creativecommons.org/licenses/by/4.0/"
}
