Mapping an object model to a data store is done by creating table maps and property maps. A table map is required for the classes in your model that you want to persist in the data store. The property maps are defined for each table map by mapping object attributes to database columns.
In the Property Maps, two types of properties are shown. Maps prefixed with an a represent attribute property maps between attributes in the object model and columns. Maps prefixed with an r represent associations (r stands for relationship) between interclass associations and foreign key relationships in the database schema.