Towards P2P-based Semantic Web Service Discovery with QoS Support

Abstract. The growing number of web services advocates distributed discovery infrastructures which are semantics-enabled and support qual-ity of service (QoS). In this paper, we introduce a novel approach for semantic discovery of web services in P2P-based registries taking into account QoS characteristics. We distribute (semantic) service advertise-ments among available registries such that it is possible to quickly iden-tify the repositories containing the best probable matching services. Ad-ditionally, we represent the information relevant for the discovery process using Bloom filters and pre-computed matching information such that search efforts are minimized when querying for services with a certain functional/QoS profile. Query results can be ranked and users can pro-vide feedbacks on the actual QoS provided by a service. To evaluate the credibility of these user reports when predicting service quality, we include a robust trust and reputation management mechanism.