@interface NSUnitSpeed : NSDimension <NSSecureCoding> @property (class, nonatomic, readonly) BOOL supportsRegionalPreference; @property (class, readonly, copy) NSUnitSpeed *metersPerSecond; @property (class, readonly, copy) NSUnitSpeed *kilometersPerHour; @property (class, readonly, copy) NSUnitSpeed *milesPerHour; @property (class, readonly, copy) NSUnitSpeed *knots; @property (class, readonly) BOOL supportsSecureCoding; + (void)initialize; + (id)icuType; + (id)baseUnit; @end