[rules-users] Rules to detect states in an object graph?!?

Sorry, me again, I'm putting together some prototype rules that operate on related objects in a graph of objects. I'm adding all objects individually to working memory and then checking the objects are related in the rule to ensure only valid combinations are selected; for example:- //Java code parent.addChild(child) wm.assertObject(parent); wm.assertObject(child); //Rule rule "Adult smurfs" when c : Child ( age > 18, p : parent ) Parent ( parentId == ( p.parentId ), type == "SMURF" ) then System.out.println("Smurf " + p.getName() + " is " + c.getAge() + " years old." end rule "Adult clangers" when c : Child ( age > 18, p : parent ) Parent ( parentId == ( p.parentId ), type == "CLANGER" ) then System.out.println("Clanger " + p.getName() + " is " + c.getAge() + " years old." end This requires that the parent-child relationship is navigable from the child end of the relationship -- child.getParent(). What other approaches does anyone else use to implement rules that span related objects? With kind regards, Michael Anstis ------------------------------------------- Next Generation Estimating System * Trafford House (Int) 8 718 2239 * Trafford House (Ext) +44 (0)1268 702239 * <mailto:manstis1@ford.com>