Description of the illustration adobj028.eps
The figure shows a type hierarchy of four types. Person_typ is the base or root type. Student_typ and Employee_typ are subtypes of Person_typ. PartTimeStudent_typ is a subtype of Student_typ.
The figure shows a type hierarchy of four types. Person_typ is the base or root type. Student_typ and Employee_typ are subtypes of Person_typ. PartTimeStudent_typ is a subtype of Student_typ.