Identification (also /DataSets/DataSet/Units/Unit/Identifications/Identification):
Assignation of a scientific or vernacular name or material classification to the unit. In cases where more than one name applies to a single unit, several identifications should be formed and flagged as preferred. Relationships between differently identified sub-units of the unit can be specified by means of the Identification-Role.
Constraints in the context of ABCD 2: