One identifier for a person such as a contributor. This element will hold an ORCID, a trusted publisher’s identifier, a JST (Japan Science and Technology Agency) identifier, or an NII (National Individual Identifier).
External Identifier: This element holds an external identifier, assigned to a contributor by an agency such as the publisher, an archive, an aggregator or hosting service, or an ORCID authority. The contents of this element should not be confused with the @id attribute, which holds an internal document identifier that can be used by software to construct a simple link.
Text, numbers, or special characters