The Knowledge Representation of the Tool System MES1——the Language PPRL1 for Designing Expert Systems

Abstract This paper introduces the language PPRL1 supported by the tool system MES1,and describes a ? of ? knowledge ?——"method"The"method"consists of ten kinds of rules It has modularity just as ? rules A knowledge base composed of "methods"is as easy maintenance as a knowledge base ? production rules ? ? ? ? multiple-level search mechanism of PPRL1 provides a kind of effective way for ? of large knowledge base.