@class NSObject; @protocol OS_os_log; @interface CALNLogSubsystem : NSObject @property (class, readonly, nonatomic) NSObject<OS_os_log> *defaultCategory; @property (class, readonly, nonatomic) NSObject<OS_os_log> *calendar; @property (class, readonly, nonatomic) NSObject<OS_os_log> *alarmEngine; @end