entity question

[cybernd]

Hi,

Is it possible to use Interfaces for OneToOne relations?

For example (Pseudocode):

Entity A implements MarkerInterface {}
Entity B implements MarkerInterface {}
Entity C {
 MarkerInterface something;
}

I know that its possible to use Inheritance, but im unable to use the same BaseClass in A and B.

I just want to avoid this:

Entity class C {
 A a;
 B b;
}

Where its only allowed to set a or b instead.

thx for your help,
Bernhard