Research On Application Of MDA In Web Service Composition Thecnology

Web service composition is a technology to get a new web service by composing the relatively simple and available web services which exist in Internet.This technology has already caused widespread attention,many research orgnizations have introuduced their own composition solution and sepecification,such as WSDL,BPEL, WSCI,OWL-S and so on.However,these standards depend on different technology platform,so it's difficult to transfer the composite service from one technology platform to another.MDA(Model Driven Architechure) is a new software development method,which was published by Object Management Group on 2002.For one thing it use platform-independent modeling language to build platform-independent model(PIM), and then transform PIM to the platform-dependent model(PSM) accroding to the mapping rules between UML and specific platform language.Lastly,to generate the application code and test framework.The advance of MDA has soveled the problem of integration and interoperability among different technology platforms.In view of the technolgy characteristics of MDA,we give a frame-work of web service composite metod that is PMWSCM(Phased MDA-based Web Service Composition Method).Aimed to get a platform-independent web service composite method,so that we can improve the platform portability of web service composite method.In order to do that,we do the following works.1).On the baisis of the idears of Graphic ang Ontology,we propose a Semantic-Based Web Service Composite Algorithm(SWSCA).This Algorithm is going to Construct Web composite graphic and choice path with idear of "broke whole into parts".The experiment proved that the method has a good success rate and efficiency of th2).Research on modelling and model Transformation of web service composite.Given the method of modelling and model Transformation,Furthermore, given the mapping rules between UML and OWL-S,and the mapping rules betwwen UML and BPEL4WS.3).Given the design and implemetation of the prototype system of PMWSCMIn a world,the PMWSCM can solve the problem of platform difficult to transplant and can adapt to the emerging of new technology and new platform.