Architecting and designing > UML 2.5 > Model Elements > Association Node > Extension
  
Extension
Extension is used when modeling a profile to extend UML.
Extension is a kind of Association. One end of the Extension is an ordinary Property and the other end is an ExtensionEnd. The former ties the Extension to a (meta)Class, while the latter ties the Extension to a Stereotype that extends the Class.
The steps to use the Extension definition to create an extension are described in Association End to Stereotype as ExtensionEnd.
See also
Association
AssociationClass
AssociationNode (Invisible)
CommunicationPath
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Association Node