Fact Types Consisting of More Than Two Roles

Up to now, we have only considered elementary sentence types and fact types consisting of two roles. In this chapter we will examine elementary sentence types and fact types that consist of more than two roles. We shall see that fact types having more than two roles can always be replaced by binary fact types by introducing an extra object type. As a consequence, an information structure diagram can always be represented such that it contains only binary fact types. This explains why up to this point we have been able to restrict ourselves so specifically to binary fact types.