[rules-users] Does generated graph rules is build to respect a disjunctive normal form ?

Hi, We use Drools at this time to explore some possibilities. We have an old system, clips based and with clips rules need to be wrote to a disjunctive normal form because they are no internal processing to transform user rule to a disjunctive normal form. As Drools generate a graph (Phreak) i would like to know if this graph try to represent rules as a disjunctive normal form ? if not i would like to know if we should to use disjunctive normal form to write rules ? It seem disjunctive normal form could allow to do some concurrent computation, i would like to know if drools will use this feature? thanks Regards