public ActionNode(String nodeId){
  super(nodeId);
  actionValues=new HashSet<Value>();
  sampler=new Random();
  actionValues.add(ValueFactory.none());
}

public ActionNode ( String nodeId ) { super ( nodeId ) ; actionValues = new HashSet < Value > ( ) ; sampler = new Random ( ) ; actionValues . add ( ValueFactory . none ( ) ) ; }
creates a new action node with a unique identifier , and no values
