I may have a brain cloud: I am having difficulty understanding the origin of some of the methods used for observations
-(void)startObservingPerson:(Person *) person
-(void)stopObservingPerson:(Person *) person
and p. 154
We implement them, but where are they declared ?
Are Start(stop)Observing(YourClassNameGoesHere) one of those
key-coding mechanisms? Where in the documentation might they be explained ??