Before the description classes are described an overview about the relationships among the description classes is presented by displaying the aggregation and inheritance hierarchies. This graphical overview consists of several figures. Each figure contains the relationships in one of the groups, see Section 3.1. The root of the first figure is the main description class. Starting from this class the relations are depicted until a class is not refined any more or until a class belongs to a different group. If a class of a different group is further structured this is represented in another figure.
If a description class A aggregates n objects of the description class B, this is depicted as follows:
If a description class D is derived from a description class C, i.e. D inherits from C, this is depicted as follows:
