as defined in ISO/IEC 646:1991-IRV, which is identical to ASCII) that are grouped into four elements as follows:

;Identifier Scheme element (2 characters): "A1" denotes a GRid.;Issuer Code element (5 characters): A unique identifier of the organisation responsible for allocating the GRid, issued by the International GRid Authority (i.e., the IFPI).;Release Number element (10 characters):