FAIR Metric - F1 - Metadata - Identifier is Unique

Why should we measure it?

FAIR Principle F1 requires that metadata be assigned a globally unique,
persistent and resolvable identifier. This metric is particularly concerned
with the globally uniqueness aspect of GUPRIs;
global uniqueness is required to prevent identifier collision across institutions,
systems and domains. Otherwise, an identifier shared by multiple resources
will confound efforts to describe that resource, or to use the identifier to
retrieve it. In this metric, the definition of global uniqueness follows
the FAIRsharing guidance on Globally Unique,
Persistent and Resolvable Identifier (GUPRI) schemas.
This guidance requires that the identifier schema must use a
controlled syntax/namespaces to avoid clashes; such syntax/namespaces must be
governed by clearly defined Authorities. If there is any way the identifier
could be created as part of another identifier system (e.g. if it
is a structured series of alphanumeric characters such as P12345 (UniProt Accession Number)
that could theoretically be used for other identifiers)
then it is not globally unique. To fulfil this requirement in practice,
it generally (but not always) requires a URL prefix of some kind.
This metric evaluates whether the identifier provided as input
satisfies the FAIRsharing definition of global uniqueness. The
evaluation assesses whether the identifier schema operates
within a governed namespace that prevents external collision
and ensures unambiguous interpretation beyond the local database context.