@class NSString, ICSDuration; @interface ICSTravelDuration : ICSProperty @property (retain, nonatomic) NSString *transparency; @property (retain, nonatomic) ICSDuration *duration; - (void)_ICSStringWithOptions:(unsigned long long)a0 appendingToString:(id)a1 additionalParameters:(id)a2; - (BOOL)alwaysHasParametersToSerialize; @end