Hi Gerhard, I'm not very experienced with the technical of side of this, but I know something about rules and ontologies. Rules can only work on some datamodel. An ontology is nothing more than a formalized conceptualisation, so a extended datamodel. Extended with what? Wel with, constraints, typing, hierarchies, and rules. Expert systems can be seen as one of more possible implementations of logic within applications. And when that logic is highly irregular and prone to change than it is a good choice. OWL is one of more possible notations of ontologies. w3c is busy with standards for OWL rules (very similar to RuleML I believe). So rules and ontologies are a perfect couple. Expert systems shells are terrific middle ware for dealing with the rules that will be formulated upon ontologies. One of the big issues in this discussion is whether Owl applications should be Closed World applications. (OWL is not closed by default, but one can state a lot more rules under the CWA)
cheers, Martijn -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] namens Gerhard Austaller Verzonden: vr 27-10-2006 23:10 Aan: [EMAIL PROTECTED] Onderwerp: JESS: JESS vs RACER Hi I somehow completely lose overview on "semantic" technologies... Does anybody know or is willing to explain where the difference/overlap... between "expert systems" like JESS/CLIPS and ontologies (with reasoners) is. Because of the rules it appears that expert systems are more powerful but maybe there is something I can express with ontologies that I can not within expert systems. Another question is about RACER PRO. The query language NRQL looks like a rule language in JESS. Is it RACER PRO's NRQL as powerful as the rules in JESS? Maybe anybody knows both systems and could give a hint or a link. And last, does anybody know a way to import a OWL ontology into JESS. Most solutions I know lose almost all restrictions. Is this an implementation issue or is it because JESS (experts system in general) are not to be used with "ontologies". Thank you very much! Gerhard -------------------------------------------------------------------- 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] --------------------------------------------------------------------
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