| House | 
 This class provides an example of a parent/inverse side of a many-to-one, uni-directional relationship where
 the parent and foreign key must use a compound value. 
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| HousePK | 
 This class provides an example compound primary key value that will be used in a many-to-one,
 uni-directional relationship. 
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| ItemPK | 
 This class provides an example primary key class for a child entity that
 derives one of its primary key values from its parent entity in a many-to-one
 relationship. 
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| ItemType | 
 This class is an example of a parent in a many-to-one, uni-directional relation where the 
 primary key of the child is derived from the primary key of the parent. 
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| State | 
 This class provides an example one/parent entity in a many-to-one, uni-directional relationship. 
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