Following in the footsteps of Drools Expert 5.2, we have added support for declarative sub-classing to Guvnor.
Visual declarative modelling support within Guvnor now supports sub-classing your imported POJO model and/or existing declared types.
Obviously the guided editors reliant upon your fact model, e.g. guided rule editor, now also include inherited fields when authoring assets.
Here's a couple of screen shots showing it is use:-
Defining a rule
You can also watch the feature being used here.