You don't need forall to solve your problem. The following rule prints all patient names which don't have problem 4711; omitting the 'not' prints those suffering from Colognitis. rule lookJoe when $patient: Patient() not ( Problem( code == "4711" ) from $patient.problemList ) then System.out.println( $patient.getName() ); end 'not' implies quantification (or exhaustive search over the domain). Without 'not' also searches all Problem entries of the current Patient so it would fire again if the patient has a problem stored more than once. -W 2009/3/20 howard goldberg <goldberg.howard(a)gmail.com&gt; > Trying to check whether a patient has a particular problem on their > problem list: > > when > > $patient : Patient() > forall ( Problem( code != "195967001") from $patient.problemList) > > but I get the following parsing error-- > > [29,41]: [ERR 101] Line 29:41 mismatched input 'FROM' expecting ')' in > rule "Dumb no asthma Rule" > [29,66]: [ERR 101] Line 29:66 mismatched input ')' expecting '(' in rule > "Dumb no asthma Rule" in pattern $patient.problemList > > What is the correct way to check for this condition? > > Thanks, > Howard > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users