Architecting and designing : UML 2.5 : Model Elements : Classifiers : DataType
  
DataType
A DataType (see Data Types) is a kind of Classifier. DataType differs from Class in that instances of a DataType are identified only by their value.
Subtypes of DataType are:
▪Enumeration
▪PrimitiveType
See also
Activity
Actor
Association
Enumeration
Extension
FunctionBehavior
Information Item
Interaction
Interface
Opaque Behavior
Primitive Type
Signal
State Machine
Stereotype
Use Case
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Classifiers