Figure 1

UML Class Diagram. This figure is a UML class diagram in which classes are grouped according to their functionalities: the graph classes have cyan borders; the node classes have orange borders; the weighting interfaces have green borders; and the storage related classes have brown borders. Dashed lines indicate that a class implements an interface (with the implementer as the source of the arrow). Solid lines indicate that a class extends the functionality of a parent class (with the extending class as the source of the arrow pointing at the parent class).