Abstract
This work presents a prototype system (named Fabricare) for the scheduling of manufacturing orders, based on holonic manufacturing systems using extended logic programming. The system is composed of several holons that cooperate among themselves using an extension to the contract net protocol named contract net with constraint propagation protocol. This protocol enables explicit cooperation among service providers that use constraint propagation in order to guarantee the precedence relationships between the different operations participating in the same task. Some precautions have been taken to avoid conflicts and combinatorial explosion. The complexity analysis of the protocol has been performed. The main agents in this system are task and resource agents; the knowledge bases of these agents are presented. Also, a notation for representation of incomplete information on an agent's knowledge base is presented.
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