Backward-chaining rule interpreter


A backward chaining interpreter for if-then rules.

Source: PROLOG programming for artificial intelligence, 3rd Edition, Harlow, 2001, ISBN 0-201-40375-7.



%  Figure 15.6   A backward chaining interpreter for if-then rules.
% A simple backward chaining rule interpreter
:-  op( 800, fx, if).
:-  op( 700, xfx, then).
:-  op( 300, xfy, or).
:-  op( 200, xfy, and).
is_true( P)  :-
   fact( P).
is_true( P)  :-
   if Condition then P,        % A relevant rule   
   is_true( Condition).        % whose condition is true 
is_true( P1 and P2)  :-
   is_true( P1),
   is_true( P2).
is_true( P1 or P2)  :-
   is_true( P1)
   is_true( P2).


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