Class Diagrams

Class diagrams express, in a general way, the static structure of a system, in terms of classes and relationships between those classes. Just as a class describes a set of objects, an association describes a set of links; objects are class instances, and links are association instances. A class diagram does not express anything specific about the links of a given object, but it describes, in an abstract way, the potential links from an object to other objects.

Simplified metamodel showing class diagrams to represent classes and relationships