Semantic Service Discovery using SAWSDL and SPARQL

Service discovery has always been a challenging task in the service oriented computing. Many approaches have already been put forward for the semantic service discovery or matchmaking task, where each approach uses it´s own logical formalism for service descriptions and user goals (i.e. formalized user request). As formalized service descriptions and user requests are used by the matchmaking process, matchmaking algorithm has a tight coupling with the underlying formalism used to describe services and goals. In this paper, we will present how SAWSDL can be used to annotate service descriptions while being agnostic to one particular service modeling formalism. The main contribution of this paper is to extend SAWSDL based service descriptions with the definition of pre and post-conditions using SPARQL query language and OWL-S Schema. We will also show how SPARQL query language can be used to formulate user goals. As a next step, we will present the matchmaking algorithm and prototype based on the matching of SPARQL based conditions and user goals.