OA7 is used to link two Actors (E39) via a certain relationship E39 Actor linked with E39 Actor: E39 (Actor) - P11i (participated in) - E5 (Event) - P11 (had participant) - E39 (Actor) Example: [ Stefan (E21)] participated in [ Relationship from Stefan to Joachim (E5)] had participant [Joachim (E21)] The connecting event is defined by an entity of class E55 (Type): [Relationship from Stefan to Joachim (E5)] has type [Son to Father (E55)]