xsd:string An Agent acts to ensure that a Rule (often a constraint on behavior) is being followed. The Agent's action is according to a general plan for Rules (such that implicit in the Rule is the affordance to certain entities to ensure that the Rule is followed). The Rule may be specified for the Duration for which it is in effect. Why don't we enforce the 20000 gun laws currently on the books across the nation? Computer systems can ruthlessly enforce rules and standards indefinitely. Can a landlord enforce rules upon tenants?