Towards a general theory of action and time
Artificial Intelligence
The British Nationality Act as a logic program
Communications of the ACM
A logic-based calculus of events
New Generation Computing
Artificial Intelligence
Nonmonotonic logic and temporal projection
Artificial Intelligence
Foundations of logic programming; (2nd extended ed.)
Foundations of logic programming; (2nd extended ed.)
A critical examination of Allen's theory of action and time
Artificial Intelligence
Meta-programming in logic programming
META-92 Proceedings of the 3rd International Workshop on Meta-Programming in Logic
A logical framework for temporal deductive databases
VLDB '88 Proceedings of the 14th International Conference on Very Large Data Bases
A guide to the modal logics of knowledge and belief: preliminary draft
IJCAI'85 Proceedings of the 9th international joint conference on Artificial intelligence - Volume 1
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The problem of representing and reasoning about two notions of time that are relevant in the context of knowledge bases is addressed. These are called historical time and belief time respectively. Historical time denotes the time for which information models reality/Belief time denotes the time lor which a belief is held (by an agent or a knowledge base). We formalize an appropriate theory of time using logic as a meta-language. We then present a metalogic program derived from this theory through fold/unfold transformations. The metalogic program enables the temporal reasoning required for knowledge base applications to be carried out efficiently. The metalogic program is directly implementable as a Prolog program and hence the need for a more complex theorem prover is obviated. The approach is applicable for such knowledge base applications as legislation and legal reasoning and in the context of multi-agent reasoning where an agent reasons about the beliefs of another agent.