[rules-users] creating a rule and storing in a drl file using APIs

Hi, I am new to Drool. I need one clarification. Can we create a rule and then store it to a .drl file using drools APIs. I have successfully created a rule using the APIs (Rule, Pattern etc). Although it is getting compared with Facts also. But i need to store the rule in drl and updated the rule whenever a user enters a new rule. I would really appreciate you guys for providing any help in this regard. Thanks in advance. Please guide. Regards, Sandeep