Using UML-based Rules for Web Services Modeling

In this paper, we present a UML- and rule-based approach to modeling Web services. The core of the solution is the UML-based rule model language (URML) that allows for developing business vocabularies and rules independent of an implementation technology. This helps developers to focus on solving problems under study rather than on low-level platform-specific details. Here we demonstrate how several Web service message exchange patterns can be modeled by URML. To support the use of the proposed solution we: extend a well-known UML tool Fujaba, employ the REWERSE rule markup language (R2ML) for encoding rules, and provide transformations between R2ML and WSDL, and thus round-trip engineering of Web services.