Smalltalk-80: the language and its implementation
Smalltalk-80: the language and its implementation
The role of frame-based representation in reasoning
Communications of the ACM
CommonLoops: merging Lisp and object-oriented programming
OOPLSA '86 Conference proceedings on Object-oriented programming systems, languages and applications
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I present the results of an experiment in retrofitting objects into an existing system. I describe a technology, based on automatic redefinition of existing functions, that allowed alternative implementations of the fundamental data types of the KEE™ knowledge-based system building tool. This technology is applicable in environments where the system's procedures can be subject to programmatic manipulation. It allows the retrofitting of objects into the implementations of other existing systems. The experience of retrofitting objects into KEE provides insight into the issues of the interaction of semantic classes and data representation and granularity in object-based systems.1