|Specifies a one to one relationship with a corresponding object.
|Specifies a single object that maps to many objects.
|Specifies a collection of objects that map to a single object.
|Specifies an object that maps to a database table.
|Specifies which database table this object maps too.
|Specifies which column a foregin key is stored in.
|Specifies an intermediate table that stores foreign keys.