Enumeration of standard identifier types.
|| The primary identifier for the resource.
|| An identifier for the evidence that supports the resource. For example, when a conclusion
about a person is extracted, analyzed and evaluated atomically within the context of a
single source, it takes the form of a (extracted) person conclusion, and the extracted conclusion
may supply an identifier for the person. As all evidence for the person is gathered, the
(working) person conclusion identifies the evidence used to support the conclusion by including
each evidence identifier in the list of identifiers for the person.
|| An identifier that has been relegated, deprecated, or otherwise downgraded. This
identifier is commonly used as the result of a merge when what was once a primary
identifier for a person is no longer primary.
|| An identifier that is considered to be a long-term persistent identifier. Applications
that provide persistent identifiers are claiming that links to the resource using the identifier