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type Printer is limited interface;
procedure Open_List (Output : in out Printer) is abstract;
procedure Append_Atom (Output : in out Printer; Data : in Atom) is abstract;
procedure Close_List (Output : in out Printer) is abstract;
procedure Transfer
(Source : in out Descriptor'Class;
Target : in out Printer'Class);
type Canonical (Stream : access Ada.Streams.Root_Stream_Type'Class) is
new Printer with null record;
overriding procedure Open_List (Output : in out Canonical);
overriding procedure Append_Atom (Output : in out Canonical;
Data : in Atom);
overriding procedure Close_List (Output : in out Canonical);
end Natools.S_Expressions.Printers;
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