The purpose of the app to be developed is managing information about countries.

The app deals with just one object type: Country, as depicted in Figure 4.2 below. In the subsequent parts of the tutorial, you will extend this simple app by adding integrity constraints, further model classes, and the associations between them.

Figure 4.2. The object type Movie

You can use the following sample data for testing your app:

More data about countries can be found in the CIA World Factbook.