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The Computer Journal 1986 29(4):340-347; doi:10.1093/comjnl/29.4.340
© 1986 by British Computer Society
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UFL: An Experimental Frame Language Based on Abstract Data Types

S. J. Young * and C. Proctor *

Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK

This paper describes an experimental language called UFL which has been designed to facilitate the programming of frame-based systems. In UFL, frames are treated as abstract data types. Each frame has a standard interface in the form of create, instantiate, read and write procedures allowing it to be given its own unique characteristics independent of the environment in which it will be used. Frames in UFL thus contain self-knowledge about how to create, instantiate and access themselves as well as the more usual application-level knowledge. This leads naturally to a language which is both extensible and powerful. Furthermore, UFL is entirely data-driven, making it particularly suitable for the implementation of intelligent knowledge-based systems.

Received June 1984.

* Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ


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