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   • 	
               ActivityNode (from BasicActivities	   , CompleteActivities	   , FundamentalActivities	   , IntermediateActivities	   , 
               CompleteStructuredActivities	   ) on page 347.
               
   An executable node is an abstract class for activity nodes that may be executed. It is used as an attachment point for exception
               handlers. 
   Package ExtraStructuredActivities	    
Issue 8239 - add subsets constraint 
   •	handler : ExceptionHandler	    [0..*] A set of exception handlers that are examined if an uncaught exception propagates to the
               outer level of the executable node. {Subsets Element::ownedElement}