A group of data elements which together specify a name identifier, used here to carry an identifier for a personal or organizational name which must match a name identifier in an instance of the <Contributor> composite within Groups P.5, P.7 or P.18, or in an instance of <NameAsSubject> within Groups P.12 or P.18, in the same Product record. The <NameIdentifier> composite is mandatory within each instance of the <ContributorReference> composite, and is repeatable to specify name identifiers of different types for the same person or organization name.