code: public Action getAction(String actionName, String nodeID) {
  		return serviceRegistry.getAction(actionName, nodeID);
  	}
docs: Returns an action by name and nodeID.
  
  @param actionName
  name of the action (in "service.action" syntax, eg.
  "math.add")
  @param nodeID
  node identifier where the service is located
  
  @return local or remote action container