string ACCEPT_EVENT
            
            string ACCESS_EVENT
            
            string APPLICATION_ACTION
            
            string CREATE_EVENT
            
            string DELETE_EVENT
            
            string DENY_EVENT
            
            string EVENT_INTERPRETATION
            
            string EVENT_MANIFESTATION
            
            string EXPIRE_EVENT
            
            string HEURISTIC_ACTIVITY
            
            string LEAVE_EVENT
            
            string MODIFY_EVENT
            
            string MOVE_EVENT
            
            string RECEIVE_EVENT
            
            string SCHEDULED_ACTIVITY
            
            string SEND_EVENT
            
            string SYSTEM_NOTIFICATION
            
            string USER_ACTIVITY
            
            string WORLD_ACTIVITY