Abstract: Traditional UDDI does not have the capability to process semantic and match to the service attribute, as a result, it has the low recall rate and matching rate. Through the service matching framework of Multi-Agent, a Petri net based OWL-S semantic matching mechanism was proposed to deal with the shortcoming, in which PNSDL description language is used to publish and request service. In virtue of the ability of Petri net for describing Web service, the matcking mechanism uses the possibility and necessity to quantify the confidence levels that the service could satisfy a request, so as to finish the matching of service. hhe matching mechanism has the advantage of powerful ability to process, modeling for Multi-service, high reality of matching and high matching rate, etc.

Key words: OWL-S semantic, Semantic matching, Service discovery, Petri net, Multi-Agent