JESS: JessTab and Protege OWL rule

[Hemant Joshi]

I have OWL with few classes and slots. I am new Jess and I would like to add few simple inference rules through JessTab. Class Hazard has subclass Earthquake which has property magnitude Class County has object property contains_facility which has Range of type Facility Class Facility has a sub-class Dam I want to create simple rule for instances X and Y like 1) If Earthquake.magnitude in county X "is greater than or equal to" 6              If Earhquake affects county X and county X has Dam Y              Then create new Hazard sub-class called Flood (and show it affects county X)      Else              Earthquake affects county X How do we write Jess rule to do arithmetic comparison and add class/instances based on that? -Hemant