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Title: Knowledge Systems and Prolog: Developing Expert, Database and Natural Language Systems by Adrian Walker, Michael McCord, John F. Sowa, Walter G. Wilson ISBN: 0-201-52424-4 Publisher: Addison-Wesley Pub Co Pub. Date: July, 1990 Format: Hardcover Volumes: 1 List Price(USD): $46.95

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Summary: Knowledge Systems and Prolog by Sowa et al.
Comment: A knowledge system involves metalevel programming; whereas,
the systems designer writes rules and rules on how to use the
rules. A rule has a head, a body (goal). A goal is either a
single or conjunction. A single goal always succeeds. A
conjunctive goal succeeds if both parts succeed. A single goal
succeeds if there is a rule whose head matches the goal and whose
body succeeds. The Sowa work is important for anyone who
designs a knowledge based system with a fairly complex rule structure.