Abstract

Web Services are considered as a dominantparadigm for constructing and composing distributed businessapplication and enabling enterprise-wide interoperability.A peer to peer architecture provides a decentralizedinfrastructure in sync with the spirit of the web andthat scales well to its size. In this paper, we present aframework enabling implicit i.e. dynamic service calls indata centric Peer to Peer Active XML language. ActiveXML is a language devoted to the management of distributeddata by embedding Web service calls into XMLdocument. The aim of implicit calls is to allow dynamicdata sources discovery through dynamic services discoveryand composition. Implicit service calls are based on the useof ontologies for describing the domain and functionalityof services to call and an Active XML engine for thecall evaluation. The evaluation process deals mainly withdynamic service composition. It consists of matching OWLSdescriptions defined in a query with service descriptionsin a peer-to-peer network. Such a network is structuredin such a way that peers with similar functionalities aregrouped together and each peer makes itself acquainted withmatching relationships between its inputs/outputs and thoseof other peers.