public   class  Car {
   private   int  _width;
   private   int  _length;
   private   int  _weigth;
   private  Colors _color;
}

 public   class  Bus : Car {
   private   int  _placeCount;
   private  BusType _busType;
   private  Hashtable _personal;
}

 public  enum TruckTypes {
  DumpTruck,
  Trailers
}

 public   class  Truck : Car {
   private   int  _maxWeight;
   private  TruckTypes _truckType;
   private  ArrayList _goods;
}

<class name = "Car" table="Car">
		<id column="id"  type="Int32">
			<generator class="native" />
		</id>
		<property name="Width" type="Int32" />
		<property name="Length" type="Int32" />
		<property name="Weigth" type="Int32" />
		<property name="Color" type="Int32" />
		<joined-subclass name="Bus" table="Bus">
			<key column="idBus"/>
			<property name="PlaceCount" type="Int32" />
			<property name="BusType" type="Int32" />
			<set name="Personal" lazy="true" table="Man">
				<key column="idBus"/>
				<one-to-many class="Man"/>
			</set>
		</joined-subclass>
	</class>