Yes, the implicit conditional operator between patterns is the conjunction (AND). If you read the drools manual you saw that all field expressions in drools have a field name as the left operand (note that "this" is a special field name). So you can't say "$b after $a". Nevertheless, even if it was possible to do what you want, it would be awful for performance, because you would be joining all events among themselves and only after joining, would the constraints be applied. Also, please note that Drools is FOL complete, so any FOL expression can be represented. Please read about the conditional elements too, not only restriction connectives && and ||. []s Edson 2009/8/25 Khalil Hafsi <hafsi(a)fzi.de&gt; > Hi , > > I am using the last version of drools fusion , what I wanted to achieve is > to pack the rules in one "statement" , i.e : > > Event(this after $b && $b after $a) > > instead of > > Event(this after $b) > Event(this after $a) > > that's because I am not limited to the sequence operator , for example when > I want to make a disjunction rule : > Cmplx1 :- a OR b > > I can't separate the events , but I must write them packed like this :: > > Event(this after $b || $b after this) > > One more question : > I assume that the relation between the different statements in a rule is > normal conjunction , i.e : > > rule "some rule" > when > a : ... > b : ... > c : ... > then > trigger action "act" > end > > > I hope I am correct ? > > Thanks, > Khalil Hafsi > > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com