Defines the type of the UMLActivity Shape Action - Sets the type of the UMLActivity Shape as Action Decision - Sets the type of the UMLActivity Shape as Decision MergeNode - Sets the type of the UMLActivity Shape as MergeNode InitialNode - Sets the type of the UMLActivity Shape as InitialNode FinalNode - Sets the type of the UMLActivity Shape as FinalNode ForkNode - Sets the type of the UMLActivity Shape as ForkNode JoinNode - Sets the type of the UMLActivity Shape as JoinNode TimeEvent - Represents the UMLActivity shape as TimeEvent