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isa(canary, bird).
 
isa(ostrich, bird).
 
isa(bird, animal).
 
isa(opus, penguin).
 
hasprop(tweety, color, white).
 
hasprop(canary, color, yellow).
 
hasprop(bird, travel, fly).
 
hasprop(ostrich, travel, walk).
 
hasprop(robin, sound, sing).
 
hasprop(bird, cover, feathers).
 
isa (robin, bird), isa(penguin, bird), isa(fish, animal). isa(tweety, canary). hasprop(robin, color, red), hasprop(penguin, color, brown) hasprop(fish, travel, swim). hasprop(penguin, travel, walk) hasprop(canary, sound, sing), hasprop(animal, cover, skin).
 
 
hasproperty(Object, Property, Value):-
 
hasprop(Object, Property, Value), hasproperty(Object, Property, Value) :-
 
isa(Object, Parent),
 
hasproperty(Parent, Property, Value).

prog.pl:21:5: syntax error: . or operator expected after expression
prog.pl:21: warning: discontiguous predicate isa/2 - clause ignored
prog.pl:21:139: syntax error: . or operator expected after expression
prog.pl:21:199: syntax error: . or operator expected after expression
prog.pl:26:72: syntax error: . or operator expected after expression
	4 error(s)
compilation failed

Standard output is empty