In UML, a class is depicted as a compartmentalized rectangle. The top section of the rectangle contains the name of the class. The middle section contains the structure of the class or a list of its attributes. Associations represent relationships between objects in associated classes. In UML, an association is drawn as a line connecting associated classes.
Multiplicity defines the number of objects that participate in the given relationship.
The multiplicity of the association is shown below. The adjacent superclass has two subclasses, subclass1 and subclass 2. The two subclasses are mutually exclusive. The class diagram for the Professional Liability Claims Handling System is shown in Figure 4. The diagram does not include any information not directly related to the tracking and paying of claims.