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No matter what persistence framework an application uses, the developer decides what is stored in the application's persistent store. This also means that the developer is in charge of validating the data before it is inserted into the persistent store. If your application uses Core Data for persisting data, then you are in luck. The framework has a number of APIs for validating objects before they are persisted to disk. In this series, I show you what options Core Data offers developers for validating objects.