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<p><b>Abstract</b>—This paper describes E-DEVICE, an extensible active knowledge base system (KBS) that supports the processing of event-driven, production, and deductive rules into the same active OODB system. E-DEVICE provides the infrastructure for the smooth integration of various declarative rule types, such as production and deductive rules, into an active OODB system that supports low-level event-driven rules only by: 1) mapping each declarative rule into one event-driven rule, offering centralized rule selection control for correct run-time behavior and conflict resolution, and 2) using complex events to map the conditions of declarative rules and monitor the database to incrementally match those conditions. E-DEVICE provides the infrastructure for easily extending the system by adding: 1) new rule types as subtypes of existing ones, and 2) transparent optimizations to the rule matching network. The resulting system is a flexible, yet efficient, KBS that gives the user the ability to express knowledge in a variety of high-level forms for advanced problem solving in data intensive applications.</p>
Knowledge base system, production rules, deductive rules, derived attributes, aggregation, negation, active object-oriented database.

A. K. Elmagarmid, I. Vlahavas and N. Bassiliades, "E-DEVICE: An Extensible Active Knowledge Base System with Multiple Rule Type Support," in IEEE Transactions on Knowledge & Data Engineering, vol. 12, no. , pp. 824-844, 2000.
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