Architecting and designing : UML 2.5 : Model Elements : Classifiers : FunctionBehavior
  
FunctionBehavior
UML specifies several types of behaviors:
Activity
State Machine
Interaction
Opaque Behavior, which has subtype FunctionBehavior
A FunctionBehavior enables you to model external functions that take only inputs and produce outputs, and are not part of the modeled system.
Example
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See also
Activity
Actor
Association
DataType
Enumeration
Extension
Information Item
Interaction
Interface
Opaque Behavior
Primitive Type
Signal
State Machine
Stereotype
Use Case
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