The paper presents a useful and novel framework of representing and processing knowledge in a rule-based expert system. It provides a high level of interaction with domain expert for automating the construction and maintenance of rule-based system. The proposed approach uses the rich concepts of software engineering for maintaining the system and provides user-friendly environment for query processing and knowledge manipulation. The construction of Petri net representation of knowledge tree, its execution for query processing and other features of the proposed framework are explained with the help of a suitable example.
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