@Retention(value=RUNTIME)
@Target(value=FIELD)
public @interface Relationship
Indicates an association between to Entity elements.
Can be used on single Entity associations or on a Collection of an Entity type.
At the moment the @Relationship annotation defines only an uni-directional relation between @Entities.
For to one relationships there is a foreignkey column generated within the database,
for to many relationships a link table is generated. The column and/or table name can be accessed via the generated DB schema.