Data dictionary approach to the maintenance of expert systems: The Knowledge Dictionary

摘要

The development and use of a Knowledge Dictionary, a tool to facilitate the documentation and maintenance of rule based expert systems, is discussed. The Knowledge Dictionary may be used to record heuristics and their component parts, facts and rule actions, in such a way that a knowledge engineer, or end user, may determine the usage of any part of the knowledge, may easily add new parts, and may run the expert system to determine the effect of the maintenance. The Knowledge Dictionary utilizes the relational data model to store the heuristics in a data form rather than in an executable code form. Use of the relational model provides the knowledge engineer with all the power of relational calculus to interrogate the stored knowledge.