[rules-users] Partial Unification / Derivation of Facts?

NOTE: Reposted because I only just subscribed to the mailing list. Hello, I have a set of Fact types which represent factors matched and used throughout the other rules. Each of these Fact types may be derived in a variety of mutually exclusive ways--ie based on the line of business or other factors. The rules are all well-defined for these Facts. Something like this: declare FactorType1 value : BigDecimal end rule "FactorType1" when LineOfBusiness( this == LineOfBusiness.LOB1 ) // some other conditions $prms : Params() // ***provisional*** where to specify needed context dependent parameters? see below then BigDecimal value = new BigDecimal("0"); // ... determine value based on conditions and $prms insert( new FactorType1(value) ); end // <some other mutually exclusive rules to derive FactorType1 here> The problem is that in the rules which match these Facts, there are many context dependent (ie *always* unique to that particular rule) parameters which must be "passed" to the derivation of those Facts. I'm referring to these as "Params" above. Now, a rule that uses FactorType1: rule "a rule that uses FactorType1" when // some conditions FactorType1( $value ) $prms : Params(prm1,prm2,prm3,...) // ***provisional*** how to indicate that FactorType1 should use these parameters in its derivation? then // perform some calculation with $value end The parameters which these Facts use cannot be asserted as Facts themselves. They are unique to the rules which match on the FactorTypes, so that would mean I'd need a duplicate rule for every rule that uses a FactorType (even with "rule inheritance", this is excessive). It's almost as if I need to specify a "partial derivation" or "partial unification" of the Fact type, which is only asserted once a rule indicates that it is providing the "unbound" portion of the derivation. I understand queries can be used for some sort of partial unification, but I have no clue how to apply them to my problem and I can't find any good examples or documentation on their usage/behavior. Thanks in advance -- View this message in context: http://drools.46999.n3.nabble.com/Partial-Unification-Derivation-of-Facts... Sent from the Drools: User forum mailing list archive at Nabble.com.