Architecting and designing : UML 2.5 : Model Elements : Structured Classifiers : Collaboration
  
Collaboration
A Collaboration is generally more abstract than a structured classifier.
It contains roles that instances can play in the collaboration.
This graphic is described in the surrounding text.
See also
Class
Activity
AssociationClass
FunctionBehavior
Interaction
OpaqueBehavior
State Machine
Stereotype
Device
ExecutionEnvironment
Component
Node
Protocol State Machine
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Structured Classifiers