oo programing question

[shoko2004@hotmail.com (shoko)]

here is my generic package:
generic
   type Element_Type is private;

   package queue is
     type Queue  is abstract tagged private; 
     
     type newqueue is new Queue ;<-- how to create new queue type?
     
     procedure Init( Q: in out Queue) is abstract;

     private
         type Queue is  abstract tagged 
           record
              value:Element_Type;
           end record;
   
   end queue; 

i need to create a new abstract type(newqueue) that will inherit from Queue.

  
then need to put the new type(newqueue) in the same generic Queue package,
and to add a new method to the new abstract type.

the reason that the new abstract type(newqueue) should be in the same package is:
i have a type that inherit from Queue  
and now i need a new type that inherit from the new abstract type (newqueue)
and will be the same as the one that inherit from Queue.

how can i do it?

thanks