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+-- FC70B00.A
+--
+--                             Grant of Unlimited Rights
+--
+--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
+--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
+--     unlimited rights in the software and documentation contained herein.
+--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
+--     this public release, the Government intends to confer upon all 
+--     recipients unlimited rights  equal to those held by the Government.  
+--     These rights include rights to use, duplicate, release or disclose the 
+--     released technical data and computer software in whole or in part, in 
+--     any manner and for any purpose whatsoever, and to have or permit others 
+--     to do so.
+--
+--                                    DISCLAIMER
+--
+--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
+--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
+--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
+--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
+--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
+--     PARTICULAR PURPOSE OF SAID MATERIAL.
+--*
+--
+-- FOUNDATION DESCRIPTION:
+--      This foundation defines a generic list abstraction. List elements can
+--      be of any (nonlimited) type. Lists are implemented as singly linked
+--      lists. Access to list elements is sequential. For each list, pointers
+--      are maintained to the first and last elements in the list, as well as
+--      the next element to be accessed.
+--
+-- CHANGE HISTORY:
+--      06 Dec 94   SAIC    ACVC 2.0
+--
+--!
+
+generic                           -- List abstraction.
+   type Element_Type is private;  -- List elems can be of any nonlimited type.
+package FC70B00 is
+
+   type List_Type is limited private;
+
+   -- Return true if current element is last in the list.
+   function End_Of_List (L : List_Type) return Boolean;
+
+   -- Read current element value; do NOT advance "current" pointer.
+   procedure View_Element (L : in List_Type; E : out Element_Type);
+
+   -- Read from current element and advance "current" pointer.
+   procedure Read_Element (L : in out List_Type; E : out Element_Type);
+
+   -- Write to current element and advance "current" pointer.
+   procedure Write_Element (L : in out List_Type; E : in Element_Type);
+
+   -- Add element to end of list.
+   procedure Add_Element (L : in out List_Type; E : in Element_Type);
+
+   -- Set "current" pointer to first list element.
+   procedure Reset (L : in out List_Type);
+
+private
+
+   type Node_Type;
+   type Node_Pointer is access Node_Type;
+
+   type Node_Type is record
+      Item : Element_Type;
+      Next : Node_Pointer;
+   end record;
+
+   type List_Type is record
+      First   : Node_Pointer;
+      Current : Node_Pointer;
+      Last    : Node_Pointer;
+   end record;
+
+end FC70B00;
+
+
+     --==================================================================--
+
+
+package body FC70B00 is
+
+   function End_Of_List (L : List_Type) return Boolean is
+   begin
+      return (L.Current = null);
+   end End_Of_List;
+
+
+   procedure View_Element (L : in List_Type; E : out Element_Type) is
+   begin
+      -- ... Error-checking code omitted for brevity.
+      E := L.Current.Item;               -- Retrieve current element.
+   end View_Element;
+
+
+   procedure Read_Element (L : in out List_Type; E : out Element_Type) is
+   begin
+      -- ... Error-checking code omitted for brevity.
+      E         := L.Current.Item;       -- Retrieve current element.
+      L.Current := L.Current.Next;       -- Advance "current" pointer.
+   end Read_Element;
+
+
+   procedure Write_Element (L : in out List_Type; E : in Element_Type) is
+   begin
+      -- ... Error-checking code omitted for brevity.
+      L.Current.Item := E;               -- Write to current element.
+      L.Current      := L.Current.Next;  -- Advance "current" pointer.
+   end Write_Element;
+
+
+   procedure Add_Element (L : in out List_Type; E : in Element_Type) is
+      New_Node : Node_Pointer := new Node_Type'(E, null); 
+   begin
+      if L.First = null then             -- No elements in list, so add new
+         L.First := New_Node;            -- element at beginning of list.
+      else
+         L.Last.Next := New_Node;        -- Add new element at end of list.
+      end if;
+      L.Last := New_Node;                -- Set last-in-list pointer.
+   end Add_Element;
+
+
+   procedure Reset (L : in out List_Type) is
+   begin
+      L.Current := L.First;              -- Set "current" pointer to first
+   end Reset;                            -- list element.
+
+
+end FC70B00;