1. A method for identifying data bearing digital objects, the method comprising: generating a first object identifier for a first object of a first object type on a first data processing system, the first object identifier having an identification context; wherein: the first system is a logical or a physical system and has a first system identifier, and the identification context includes the first system identifier or one or more second object identifiers of one or more respective second objects or both; and providing the first object identifier with the identification context to identify the first object uniquely.