Modalities in Knowledge Representation. Hustadt, U. & Nonnengart, A. In Rowles, C., Liu, H., & Foo, N., editors, Proceedings of the 6th Australian Joint Conference on Artificial Intelligence (AI'93) [Melbourne, Australia, 16-19 November 1993], pages 249-254, 1993. World Scientific.
Modalities in Knowledge Representation [pdf]Paper  abstract   bibtex   
Standard knowledge representation systems are supposed to be able to represent either common or individual knowledge about the world. In this paper we propose an extension to such knowledge representation systems which, in a uniform manner, allows to express beliefs of multiple agents as well as knowledge, desire, time and in fact any modality which has a first-order predicate logic possible world semantics.

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