I think that Calvin said: >>How can I extract these 2 facts out? Hi Calvin, These operations are so basic to Jess that you might want to review them in greater detail before proceeding. If you can get a copy of Jess In Action http://www.manning.com/friedman-hill, study chapters 1-7 thoroughly. There are numerous examples of how to do this very thing. If not, go to http://herzberg.ca.sandia.gov/jess/docs/61/ and look at Section 2: http://herzberg.ca.sandia.gov/jess/docs/61/language.html, sub sections 2.7 and 2.8 in particular.
If you're really unsure about the number of attributes at the time that you assert the fact, consider using "unordered" facts - facts with slots - to store your data. One variation (and there are so many ways to do this) might be a generic "attributes" fact like this: (deftemplate adv-attributes (slot id) (multislot attribs)) Then you can assert facts like: (assert (adv-attributes (id 1) (attribs radio-advertisement low-budget))) (assert (adv-attributes (id 2) (attribs radio-advertisement control-message-frequency))) As for "extracting these facts out", I'm not sure if you want a reference to the fact or one of its slot values. To get a reference to a fact, simply bind the LHS pattern to a variable like this ?fact <- (adv-attributes (id ?id) (attribs $?attribs)) For example: (defrule print-adv-attributes-facts "This rule matches all adv-attributes facts and binds their id and attribute slots to variables" ;; Only use the $ prefix to match multifields in LHS patterns. Drop it on the RHS of rules. ?fact <- (adv-attributes (id ?id) (attributes $?attribs)) => (printout t "Fact-id=" ?fact crlf) (printout t "id=" ?fact crlf) (printout t "attribs=" ?fact crlf)) If you put all this in a batch file and run it, Jess will print: Jess> (batch cal.clp) MAIN::show-adv-attributes: +1+1+1+t ==> Focus MAIN ==> f-0 (MAIN::initial-fact) ==> f-1 (MAIN::adv-attributes (id 1) (attribs radio-advertisement low-budget)) ==> Activation: MAIN::show-adv-attributes : f-1 ==> f-2 (MAIN::adv-attributes (id 2) (attribs radio-advertisement control-message-frequency)) ==> Activation: MAIN::show-adv-attributes : f-2 FIRE 1 MAIN::show-adv-attributes f-2 ------------------------- Fact-id=<Fact-2> id=2 attribs=(radio-advertisement control-message-frequency) FIRE 2 MAIN::show-adv-attributes f-1 ------------------------- Fact-id=<Fact-1> id=1 attribs=(radio-advertisement low-budget) <== Focus MAIN 2 Jess> Hope this gives you some traction. Cheers, Jason ------------------------ Jason Morris Morris Technical Solutions [EMAIL PROTECTED] www.morristechnicalsolutions.com fax/phone: 503.692.1088 -------------------------------------------------------------------- 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] --------------------------------------------------------------------
