ISWC: International Standard Musical Work Code.
ISRC: The International Standard Recording Code is the international identification system for sound recordings and music video recordings.
ADID: Advertising Digital Identification.
DDEX: Digital Data Exchange.
UMID: Unique Material Identifier is a unique identifier for locally created audiovisual material.
GRID: Global Release Identifier
REGID : Used by registrants to identify their works. It is unique across all the works submitted by a registrant during its Registrant lifetime.
AGICOA : AGICOA number
OTHER: Any other external identifier that is not covered in this list (.