Δυναμικό πλαίσιο ομοιογενούς δημοσίευσης και αναζήτησης σημασιολογικά εμπλουτισμένων υπηρεσιών ιστού

Abstract

Web service technology extends the existing web infrastructure by transforming it from a repository of documents to a source of services. As the number of web services increases, the provision of the appropriate service publication and discovery framework is of paramount importance for exploiting the full potential of the web service technology. Various solutions to this problem have been proposed which, apart from their offered advantages, suffer from the following disadvantages: (i) most of them are syntactic-based leading to poor precision and recall, (ii) they are not scalable to large numbers of services and (iii) they are incompatible, thus yielding in cumbersome service publication and discovery. In this thesis, we present PYRAMID-S (A Peer to peer dYnamic fRAmework for seaMless PublicatIon and Discovery of Semantic Web Services) which is a framework that addresses these disadvantages by providing a scalable framework for unified publication and discovery of semantically enhanced services over heterogeneous registries. PYRAMID-S uses a hybrid Peer-to-Peer topology to organize web service registries based on domains. In such a topology, each registry retains its autonomy, meaning that it can use the publication and discovery mechanisms as well as the ontology of its choice. The proposed system, PYRAMID-S, helps passing from large amount of services distributed across the web to small amount of services of high value to the requester in an efficient, unified and scalable way. The viability of this approach is demonstrated through the implementation and experimental analysis of a prototype.