[rules-users] Re-insert modified instance of same fact and Truth maintenance

[Abhay B. Chaware]

Could be a basic question, but thought I should get clarified.
I insert a fact say, a Computer object with some attributes ( hdd=10GB ) set, in working memory. Then I have a rule that checks if a Computer with 10GB hdd is inserted .. if yes, then it does a logicalInsert of an Alert object with computerId = this computer's id.
Now I would like to re-insert the same fact with HDD changed to '20gb' and would like drools to automatically retract the Alert for this computerId .. how do I achieve this ?
-abhay

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