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You can see the rough structure of the UML language in Figure 3.2 . There are
two levels to be looked at. We can distinguish between structure and behavior elements.
Structure elements include classes and components, for example. You use
them to describe the structure of your system. Functions are described by means
of behavior elements. They include activities, state machines, and interactions.
The column ??? Others ??? includes elements that refer to both structure and behavior
(cross-section functionality).
On the other level we distinguish between model and diagram. The model contains
the full description of the system. In contrast, a diagram is only the visualization
of the model with regard to a certain aspect. For example, there are class
diagrams that show classes and their associations, but no attributes or operations.
And there are other class diagrams that show all attributes and operations, but
only few selected associations. Both diagrams are based on the same model. Figure
3.3 is a schematic view of this example.


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