A diagram is thus a graphical view that represents a part of a model. The model of an enterprise can
be considered to be a repository that includes all concepts, properties, processes, tasks, actors, and so
on, and all the different types of links that associate them. Diagrams are only one of a number of representation forms that exist for a model, some of which take graphical form (for example, class diagrams or process diagrams), others textual or syntactic form (for example, business rules), and still others table form (for example, TOGAF matrices), as well as other forms, such as model element hierarchies. For this reason, Figure 5.4 shows the classic layout of a modeling tool. The explorer on the left
is used to browse the entire model, while the diagram on the right-hand side graphically represents a
small subset of the model.