Hi, I don't think Drools supports this directly, but would this not be as accomplishable with DSL? Your Drools rule could then be written something like this (bare in mind I'm no DSL expert):- DSL: [when]There is a hemoglobin lab result with=LabResult(type==hemoglobin) [when]- a value less than {v}=value<{v} Rule: There is a hemoglobin lab result with - a value less than 42 With kind regards, Mike -----Original Message----- From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Yoni Mazar Sent: 26 June 2008 15:29 To: rules-users(a)lists.jboss.org Subject: [rules-users] Package parameters Hi all, We are at the begining of a new clinical decision-support project. We are considering using a BRMS to manage and execute our business logic. As part of our research, we evaluated JRules and Drools. JRules has a nice feature that we could not find in Drools. We'd like to know if we are misunderstanding something, or maybe this feature is missing. In JRules, one can define a ruleset (corresponds to a package) with parameters. Each parameter has a datatype (a class), a direction (in/out/inout), and an alias. Then, within the rules, the user can refer to the parameter alias. For example, a user can define a ruleset with the following parameters: *class=LabResult, direction=in, alias=hemoglobin *class=LabResult, direction=in, alias=creatinin Then, within a rule, one can write: when hemoglobin.value<10 and creatinin.value>34 then... Now, the application retrieves the patient data accordingle (hemoglobin and creatinine data separetly) and sets the ruleset parameters: ruleset.parameters.add("hemoglobin",hemoglobinFact) ruleset.parameters.add("creatinin",creatininFact) This approach simplifies the rule authoring process significantly! Writing this logic in Drools will be: package cdss import LabResult; rule when LabResult(type=hemoglobin && value <10) LabResult(type=creatinin&& value <34) then... workingMemory.Assert(hemoglobinFact); workingMemory.Assert(creatininFact); Does someone has an idea how to bridge this gap using Drools? Im not sure if using parameters JRule complies with JSR94 specification. Thanks, Yoni -- View this message in context: http://www.nabble.com/Package-parameters-tp17979190p17979190.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users