Using Join Operation in Relational Database to Composite Web Services

Web service composition is an important research work in the area of service computing. In order to enhance service composition efficiency and accuracy, this paper proposes a Web service composition method based on the join operation in relational database (RDB). It stores Web services and ontology information using relational database. The semantic reasoning relationship and the state path of ontology concepts are used to do calculation. The related tables are joined using the join operation in RDB from aspects of services interface (Input and Output) and capability (Precondition and Effect). The services can be composited dynamically and flexibly. The effectiveness of the proposed method is validated through experiments.