> How can you define relationships in the mapped superclass that are
*specified* 
> in terms of the entities?

Quite simple:

@Entity
class Article extends Article2

@MappedSuperclass
class Article2
  @ManyToOne
  private Manufacturer; // note: not Manufacturer2!!


> You can always change the annotation from @MappedSuperclass to an @Entity
> and 
> make the class abstract.

I do not believe that will work. Aim of the game is that the class returned
by queries, etc, must be the class containing all the business logic. So
AFAIK that must be the @Entity. That class must extended a class that
contains the reversed engineered mappings.


> They might, but that would be beyond the spec and as such not a portable
> solution.

If this is beyond the spec: what is @MappedSuperclass intended for?

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