| Borrower | This class provides an example of the one/parent side of a one-to-many, bi-directional relationship
 that will be realized through a foreign key from the many/child side of the relationship. | 
| Car | This class is an example of the one/inverse side of a one-to-many, bi-directional
 relationship mapped using a compound foreign key that is partially derived from the 
 parent primary key. | 
| Loan | This class provides an example of the many/child side of a many-to-one, bi-directional relationship. | 
| Purchase | This class provides an example of the one/inverse side of a one-to-many, bi-directional 
 relationship realized through a join-table mapped from the owning/many side. | 
| SaleItem | This class provides and example of the many/owning side of a many-to-one, bi-directional 
 relationship that is realized using a join-table. | 
| Tire | This class provides an example of the many/owning side of a many-to-one, bi-directional 
 relationship mapped using a foreign key and that foreign key is used to derive the 
 primary key of this class. | 
| TirePK | This class provides an example of an IdClass used by a child entity in a 
 many-to-one, bi-directional relationship where half of its primary key is
 derived form the parentId; |