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What do you mean by classifiers in unified modeling language?
Answer:
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 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 Classifiers in UML 2.2 are:
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 Classifiers in 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
First answer by Kirfa.
Last edit by Kirfa.
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