Relates a manifestation to an appellation consisting of a code, number, or other string, usually independent of natural language and social naming conventions, used to identify a manifestation.
An identifier for the manifestation includes registered identifiers from internationally recognized schemes, other identifiers assigned by publishers and others following internally devised schemes, identifiers known as fingerprints constructed by combining groups of characters from specified pages of early printed resources, publisher's numbers for notated music, and plate numbers for notated music.