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This paper examines a decentralized and self-organizing approach inspired by ant behavior for building an information system in which metadata related to Grid resources is disseminated and logically organized. Each agent/ant, by analyzing its own past activity, copies and moves resource metadata among Grid hosts and contributes to collect resources belonging to the same class in a restricted region of the Grid, so decreasing the system entropy. A semi-informed resource discovery protocol exploits the ants' work: asynchronous query messages issued by clients are driven towards "Representative peers" which maintain information about a large number of resources having the required characteristics.
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