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Classifier is an abstract UML metaclass to support classification of instances according to their features. Classifier describes a set of instances that have common features. A feature declares a structural (properties) or behavioral (operations) characteristic of instances of classifiers.

More formally, in UML 2.2 Classifier is (extends):

  • Namespace
  • Type
  • Redefinable Element

Namespace is an element in a model that can own (contain) other named elements. As a Namespace, classifier can have features.

Type represents a set of values. A typed element that has this type is constrained to represent values within this set. As a Type, classifier can own generalizations, thereby making it possible to define generalization relationships to other classifiers.

Redefinable Element is an element that, when defined in the context of a classifier, can be redefined more specifically or differently in the context of another classifier that specializes (directly or indirectly) the context classifier. As a Redefinable Element, it is possible for classifier to redefine nested classifiers.

Some examples (subclasses) of Classifiersin UML 2.2 are:

  • Class
  • Interface
  • Association
  • DataType
  • Actor (subclass of Behaviored Classifier)
  • Use Case (subclass of Behaviored Classifier)
  • Artifact
  • Component (subclass of Class)
  • Signal
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