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    STUDIA INFORMATICA - Issue no. Sp.Issue%202 / 2009  
         
  Article:   WEB SERVICE COMPOSITION APPROACH BASED ON A GRAPH OF SERVICE CELLS.

Authors:  IOAN SALOMIE, AGOTA RIGER, VALENTIN RADOI, DANIELA INOAN, VIORICA R. CHIFU. 		 
       
         
  Abstract:   This paper proposes a new method for the automatic composition of semantic Web services. The proposed method combines graph construction and sub-graph search to determine all the composition candidates. First, the method constructs a directed acyclic graph, which represents the functional semantics of the Web services as well as the semantic dependency between the inputs and the outputs of the services. Second, composition sub-graphs that satisfy the functionality requested by a client are searched for and ranked according to certain criteria such as user preferences and QoS. Finally, the method selects the best service composition for a given user request. To evaluate the method, an experimental framework that automatically composes services has been implemented.

Key words and phrases. semantic Web services, Web service composition, graph of service cells. 		 
         
     
         
         
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