Changes

[[Image:iPhoneCoreDataStackArchitecture.png|Core Data Stack Architecture diagram]]

As we can see from the above figure, the iOS iPhone based application sits on top of the stack and interacts with the managed data objects handled by the managed object context. Of particular significance in this diagram is the fact that although the lower levels in the stack perform a considerable amount of the work involved in providing Core Data functionality, the application code does not interact with them directly.