Specification refmap-ex-maplet

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enrich
   refmap-maplet
with
   functions 
       . =>_ : Ref[A] → Map[Ref[A], A] → Bool;
       . =>? : Ref[A] → Map[Ref[A], A] → Bool;
   
   variables 
       o : A;
       r : Ref[A];
       h : Map[Ref[A], A];
       hP : Map[Ref[A], A] → Bool;
   
   
   axioms 
      mapex: r.=>_ = _∃(λ o. r => o);
      used for: ls;
      
      mapornull: r.=>? = (r = null ⊃ emp;r.=>_);
      used for: ls;
   
   
end enrich