/*NSMetadataQueryDidUpdateNotification


Posted when the receiver’s results have changed during the live-update phase of the query.*/

NSString * const NSMetadataQueryDidUpdateNotification;

/*NSMetadataQueryDidFinishGatheringNotification


Posted when the receiver has finished with the initial result-gathering phase of the query.*/

NSString * const  NSMetadataQueryDidFinishGatheringNotification;