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procedure Next
(Object : in out Descriptor;
Event : out Events.Event) is abstract;
-- Update Object to reflect the next event in the S-expression
procedure Next (Object : in out Descriptor'Class);
-- Call Next discarding current event
procedure Close_Current_List (Object : in out Descriptor'Class);
-- Repeatedly call Next until reaching end-of-input or the Close_List
-- event matching the current list.
-- Note: if current event is Open_List, then this is the designated list
-- while for other events, including Close_List, the designated list
-- contains the current object or the just-closed list.
private
use type Ada.Streams.Stream_Element;
use type Ada.Streams.Stream_Element_Offset;
use type Ada.Streams.Stream_Element_Array;
use type Events.Event;
end Natools.S_Expressions;
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