UFL: An Experimental Frame Language Based on Abstract Data Types

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Abstract
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.

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