]> 2.0 Rei Action and Speech act Ontology A Rei Action All actions within the policy domain Resources on which the action operates State of the environment before the action can be performed State of the environment after the action can be performed All speech acts modeled within Rei 1 1 1 receiver of speech act speech act holds only if condition is satisfied content of speech act, either an action or a deontic If valid, causes a permission to be added If valid, causes a prohibition to be added Can request a permission or an action. If accepted, leads to either an obligation on the requester or a delegation. If valid, causes the last request to be nullified If valid, causes an obligation on the receiver If valid, causes an obligation on the sender first action and the second action first action is followed by the second either the first action or the second first action can only be performed once first action can be performed repeatedly