[rules-users] parametrized rules

Hi all, I'm new to Drools, and wonder how I can most cleanly write down rules for the following. (For the sake of example) Say I have an object that needs to be processed season-dependent. I basically need a rule like: rule when Date( month == X, day >= Y, day <= Z) // Some date containing object then System.out.println("Season is "+R) // Store season in associated object end And fill in X, Y, Z and R with: X Y Z R 1 1 31 Winter 2 1 29 Winter 3 1 21 Winter 3 22 31 Spring 4 1 30 Spring 5 1 31 Spring 6 1 21 Spring 6 22 30 Summer 7 1 31 Summer ... Should I expand all this rules by hand, and define 16 rules in my rule file? Or can I parametrize the rules and have this done automagically? Thanks a lot, Tim van Heugten