Relationship types characterize the type of relationships between two object types.
In the model type Event-driven process chain (EPC), for example, the connection type activates characterizes the link between the object types Event and Function.
A relationship type can occur in several model types. The relationship type is input for occurs in model types including Event-driven process chain (EPC) and Function allocation diagram (FAD). A model type contains structurally non-relevant and structurally relevant relationship
types.