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This Concept Map, created with IHMC CmapTools, has information related to: Cocoa, Observer registers using NSObject:addObserver:forKeyPath:options:context:, Formal Protocols equivalent to Java Interfaces, Key/Value Observing is ????, Informal Protocols type of Protocols, Key/Value Coding is Dependent Keys, Formal Protocols type of Protocols, Informal Protocols see respondsToSelector:, Informal Protocols should have Implementation, Formal Protocols must have Implementation, Key/Value Coding is NSObject:addObserver:forKeyPath:options:context:, Key/Value Coding is - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;, Observer gets callback - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;, Loose Typing see id