public class DomainRange {
   protected Domain d;
   protected Range  r;

   public DomainRange(Domain d, Range r) {
      this.d = d;
      this.r = r;
   }

   public Domain getDomain()     { return d;    }
   public Range getRange()       { return r;    }
   public void setRange(Range r) { this.r = r;  }
}