如何从NSManagedObjectContextObjectsDidChangeNotification中排除属性

I'm using CoreData in my application and depend on the NSManagedObjectContextObjectsDidChangeNotification. I have already subclassed NSManagedObject for all my Entities and created the properties and @dynamic accessors. Is it possible to exclude some properties of specific entities from the notification? If so, how would I do it? :-)I'm using CoreData in my application and depend