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A classifier is a category of Unified Modeling Language (UML) elements that have some common features, such as attributes or methods.

Overview

A classifier is an abstract metaclass classification concept that serves as a mechanism to show interfaces, classes, datatypes and components.

A classifier describes a set of instances that have common behavioral and structural features (operations and attributes, respectively).

A classifier is a namespace whose members can specify a generalization hierarchy by referencing its general classifiers.

A classifier is a type and can own generalizations, thereby making it possible to define generalization relationships to other classifiers.

A classifier is a redefinable element, as it is possible to redefine nested classifiers.

All objects that can have instances are classifiers.

Important aspects

• A classifier defines a namespace.
• A classifier contains a set of features.
• A classifier is generalizable.

Types of UML classifiers

• Class
• Component
• Datatype
• Interface
• Node
• Signal
• Subsystem
• Use Case

Predefined UML classifiers

• Actor
• Association
• Class
• Component
• Datatype
• Interface
• Node
• Signal
• Subsystem
• Use Case

References

1. "UML Classifier". Retrieved December 7, 2012.

v t e Unified Modeling Language
Actors	Organizations Object Management Group UML Partners Persons Grady Booch Ivar Jacobson James Rumbaugh
Concepts	Object oriented Object-oriented programming Object-oriented analysis and design Object-oriented modeling Structure Actor Attribute Artifact Class Component Interface Object Package Profile diagram Behavior Activity Event Message Method State Use case Relationships Association Composition Dependency Generalization (or Inheritance) Extensibility Profile Stereotype Other Multiplicity
Diagrams	Structure Class Component Composite structure Deployment Object Package Behaviour Activity State Machine Use case Interaction Communications Sequence Interaction overview Timing
Derived languages	Systems Modeling Language (SysML) UML eXchange Format (UXF) XML Metadata Interchange (XMI) Executable UML (xUML)
Other topics	Glossary of UML terms Rational Unified Process List of Unified Modeling Language tools Object Modeling in Color

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