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License: GNU General Public License v2.0
Tools for the four-valued logic programming language BelLog
License: GNU General Public License v2.0
policynot(X,R) :- !policy(X,R)
policy(X,R) :- (poleval(X,R) -bot-> true)
poleval(ann,req) :- true
poleval(bob,req) :- false
policynot(bob,req) results in TOP, and not TRUE. The problem is fixed when the predicate policynot is renamed to something that does not contain "not".
Predicate symbols that are used in the rules but are do not appear in any rule's head are currently not supported in the tool. The tool must detect such predicate symbols define them (otherwise XSB throws an error).
p(X,Y) :- (p(X,Z) ^ !p(Z,Y))
p(X,Y) :- q(X,Y)
q(a,b) :- true
q(b,c) :- top
p(a,c) should be top.
add support for atoms of the form contains(X,Y)@fs. This should be translated automatically to contains(fs, X, Y)
Building policy
permit(Subject, cab) :- (daytime ^ employee(Subject))
permit(Subject, cab) :- (!daytime ^ employee(Subject) ^ validPin(Subject))
Office Policy
permit(Subject, cnb_f110) :- owns(Subject, cnb_f110)
permit(Subject, cnb_f110) :- delegate(SubjectA)@subject'
Stored on the card
owns(paul,cnb_f110) :- true
delegate(srdjan)@paul :- true
Free variables in heads must not be allowed.
p(a) :- top
p(b) :- bot
q :- !p(X)
q should be true but its false
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