Representing WSDL with Extended UML

Web services are emerging to provide a systematic and extensible framework for interactions of applications, built on existing Web protocols and based on open XML standards. In spite of the existence of several middleware platforms that support Web service development, the lack of a solid methodological base for the development of Web services, as well as service-oriented applications, give rise to the need of methods or modeling techniques that guarantee the quality in the development of this kind of applications. MIDAS is a model-driven methodological framework for the agile development of Web Information Systems (WIS). MIDAS is based on Model Driven Architecture (MDA) and defines Platform Independent Models (PIMs) and Platform Specific Models (PSMs) according to the aspects of content, hypertext and behavior; it proposes some mapping rules between the different models. MIDAS proposes to model the behavior of a WIS following the service oriented approach. In this work we focus on the proposed PSM for WIS behavior modelling, presenting the UML extension for the representation of Web Service Description Language (WSDL). The proposed extension provides a UML notation which on one hand, allows obtaining graphic representation of a Web service and, on the other hand facilitates the automatic generation of WSDL code from a UML diagram.