Web service technologies are becoming increasingly important for integrating systems and services. There is much activity and interest around standardization and usage of Web service technologies. Contemporary Web services are described in the Web Service Description Language (WSDL). However, WSDL documents can be difficult to understand for service developers. This article recommends a model-driven process for Web service development combining the graphical modeling language UML with WSDL. The Unified Modeling Language (UML) is developed by Object Management Group. In the proposed process, Web service descriptions (in WDSL) are converted to UML; their UML models are integrated to form composite Web services; and then the new Web service descriptions are exported. The main contribution of this article is a “pure UML” modeling strategy supported by implementation of two-way conversion rules between the UML models and the WSDL documents.
Model-Driven Development (MDD) poses new quality requirements to models. This paper presents these requirements by specializing a generic framework for model quality. Of particular interest are transformability and maintainability, two main quality criteria for models to be used in MDD. These two are decomposed into quality criteria that can be measured and evaluated. Another pertinent discussion item is the positive implication of MDD-related tools, both on the models in particular and on the success of the MDD process.
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