Hi Piotr, IMHO, the difference between Prolog and JESS is an important insightful question. The difference is really the difference between backchaining (PROLOG) and forward chaining (JESS/RETE families). So this begs the question, "What is backchaining and forward chaining?".
If this is your first time with these concepts, don't feel bad if you need to ask several people. Maybe one of us will say the right thing that will put everything together for you. Here is my short attempt. For the moment, try to think of both as just production rules in a grammar...like in yacc or lex or something. A backchaining grammar is one that starts with the goal rules (e.g. PROGRAM) and backchains to the commas, numbers, and reserved words (as in PROLOG). Recall that these are also known as the token symbols. OTOH a forward chaining system starts with the token symbols and tries to choose the best production rules to use (aka "fire" as in JESS/RETE) to get to the detection of a complete PROGRAM. Also BTW, this is sometimes referred to as top-down (PROLOG) vs bottom-up (JESS), respectively. I hope the above thumbnail explanation can help. But I am forced to add one thing that may seem very confusing. You can actually use either language to do chaining in the wrong direction. You can use PROLOG to fake forward chaining. And you can use JESS/RETE to fake backchaining. In fact, some RETE systems (e.g. old "big ART" and Paul Haley's rete) have backchaining already built in. (Apologies to Ernest Friedman-Hill if he added this since the last time I looked.) Over the years of consulting that I have done, I have found people backchaining with a forward-chain-only rete without actually knowing it! At any rate, I hope my brief explanation can help. Best of luck with your thesis. Steve Lindner On Saturday 26 May 2007 09:49, Piotr Antkowiak wrote: > Hello, > > I will write my master work about Jess and Prolog > Title: "Jess - a Java software package for rule-based programing." > > I will be compare Prolog and Jess. On mine university we learned only > Prolog and now I try rewrite some program from Prolog to Jess. > > My first program (I have still problem with writing this rule > "2)the golfer to Fred's immediate right is wearing blue pants;" > in my Prolog program) > Golfer problem from "Jess in Action" book > http://antkowiak.fr.pl/jess/golfers.pro (mine script) > http://antkowiak.fr.pl/jess/golfers.clp (script form book) > > My request: > maybe somebody rewrite some program from Prolog to Jess or fome Jess to > Prolog and have some conclusions why Jess/Prolog is better or other > conclusions about those programs. I will be thankful for all indicators. > > I can using google ;-) and I read few article about this but it is too > little for me. > > Thank You very much for any help. > > Ps. I apologize for my English -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
