Architecting and designing : SysML : Model Elements : Association Node : Association
  
Association
An Association classifies a set of tuples representing links between typed instances.
To create an Association between two Model Elements or Classifiers, you create an AssociationClass and then relate the AssociationClass to each Model Element or Classifier through an AssociationNode to Class as Property relationship. For instructions on how to do this, see How to create an Association.
See also
AssociationClass
Extension
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Association Node