[HAS-PART ========= Syntax: (ask [has-part Instanz <bql-Var>] <continuation>) HAS-PART liefert die Werte der Relationen, die zwischen den Bestandteilen einer Instanz bestehen. ###>[HAS-PART ========= Syntax: (ask [has-part instance <bql-var>] <continuation>) HAS-PART provides the values of the relations that exist between the parts of an instance.