Definitions of an actor's function within a group or legal body. An actor can for example be member of a legal body and this membership is defined by a certain function during a certain period of time. E.g. actor "Charlemagne" is member of the legal body "Frankish Reign" from 768 to 814 in the function of "King" and he is member of the legal body "Roman Empire" from 800 to 814 in the function "Emperor".