Beginning C# 2008 Objects: From Concept to Code

10.8. "Mixing and Matching" Relationship Notations

It's possible to intertwine the various relationship types in some rather sophisticated ways. To appreciate this fact, let's study the model in Figure 10-36 to see what it's telling us. Note that the UML model shown in Figure 10-36 is a bit more complicated than the SRS model in that it includes University, School, and Department classes that won't be part of the SRS.

Figure 10.36. A sample UML model

First of all, we see some familiar uses of aggregation and inheritance.

The use of aggregation in the upper-left corner of the diagram—a two-tier aggregation—communicates the facts that a University ...