By Dennis Merritt
While I evaluate the books on specialist structures in my library with the creation specialist platforms i do know of, I notice that there are few stable books on construction specialist structures in Prolog. after all, the set of tangible construction platforms is a bit small for a sound statistical pattern, at the very least on the time and position of this writing - right here in Gennany, and within the first days of 1989. yet there are at the least a few structures i've got obvious operating in genuine lifestyles advertisement and commercial environments, and never merely at alternate indicates. i will be able to realize the main awesome one in my rapid local. it really is put in within the cellphone store of the Gennan Federal PTT close to the Munich nationwide Theater, and is helping configure mobile platforms and small PBXs for typically inner most consumers. It has a neat, graphical interface, and constructs and costs anyone mobile install interactively earlier than the very eyes of the buyer. The hidden positive factors of the procedure are much more amazing. it really is a part of knowledgeable approach community with a disbursed wisdom base that would develop to approximately a hundred and fifty installations in each phone store all through Gennany. each one of them may be up-to-date separately in a single day through Teletex to provide precise bargains or to evolve the choice procedure to the offers at the moment to be had on the neighborhood ware homes.
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Extra info for Building expert systems in Prolog
The call to update from fg is modified to fill in the new argument with a rule number: fg(Goal, CurCF) :rule(N, lhs(IfList), rhs(Goal, CF)), ... Building Expert Systems in Prolog 39 update(Goal, NewCF, CurCF, N), ... Now that the supporting rules for each derived fact are in working storage, we can answer a user's question about how a fact was derived. The simplest thing to do is to have how simply write the list of rules used. It is probably of more interest to the user to actually display the rules as well.
Why. [nostrils(external_tubular), order(tubenose), family(albatross), bird(laysan_albatross)] nostrils : external_tubular? We can further use clause to answer how questions. In Clam we chose to save the derivations in the database. For native Prolog it is easier just to rederive the answer. how(Goal) :clause(Goal, List), prove(List, ), write(List). It is also possible to ask whynot questions, which determine why an expected result was not reached. This also uses clause to find the clauses that might have proved the goals, and goes through the list of goals looking for the first one that failed.
Some of those rules would be expressed in Oops like this: rule id6: [1: has(X, pointed_teeth), 2: has(X, claws), 3: has(X, forward_eyes)] ==> 48 Chapter 5 - Forward Chaining [retract(all), assert(isa(X, carnivore))]. This rule would fire if working storage contained the Prolog terms: has(robie, pointed_teeth) has(robie, claws) has(robie, forward_eyes) When the rule fired, these three terms would be removed by the retract(all) action on the RHS, and would be replaced with the term: isa(robie, carnivore) Since the working storage elements which matched the conditions were removed, this rule would not fire again.