Class Diagram Objects

Class

Set of objects sharing the same attributes, operations, methods, and relationships. See Classes (OOM).

Interface

Descriptor for the externally visible operations of a class, object, or other entity without specification of internal structure. See Interfaces (OOM).

Port

Interaction point between a classifier and its environment. See Ports (OOM).

Generalization

Link between classes showing that the sub-class shares the structure or behavior defined in one or more superclasses. See Generalizations (OOM).

Require Link

Connects a class, component, or port to an interface. See Require Links (OOM).

Association

Structural relationship between objects of different classes. See Associations (OOM).

Aggregation

A form of association that specifies a part-whole relationship between a class and an aggregate class (example: a car has an engine and wheels). See Associations (OOM).

Composition

A form of aggregation but with strong ownership and coincident lifetime of parts by the whole; the parts live and die with the whole (example: an invoice and its invoice line). See Associations (OOM).

Dependency

Relationship between two modeling elements, in which a change to one element will affect the other element. See Dependencies (OOM).

Realization

Semantic relationship between classifiers, in which one classifier specifies a contract that another classifier guarantees to carry out. See Realizations (OOM).

Inner link

Exists when a class is declared within another class or interface. See Composite and Inner Classifiers.

Attribute

N/A

N/A

Named property of a class. See Associations (OOM).

Operation

N/A

N/A

Service that can be requested from a class. See Operations (OOM).