#import "REANode.h" @interface REAClockNode : REANode @property (nonatomic, readonly) BOOL isRunning; - (void)start; - (void)stop; @end @interface REAClockOpNode : REANode @end @interface REAClockStartNode : REAClockOpNode @end @interface REAClockStopNode : REAClockOpNode @end @interface REAClockTestNode : REAClockOpNode @end