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In this paper we present a rapid prototyping development approach for developing service-oriented applications on OSGi platform that combines incremental and evolutionary prototyping. Prototypes are defined as executable UML models. In order to ensure simple and fast definition of UML models, we apply the DRY ("don't repeat yourself'') principle and the concept of "convention over configuration'' introduced in the context of rapid application development. Update transformations in the small may be applied onmodel elements explicitly selected by the user in order to rapidily create new model elements based on some conventions. During the development the system may contain platform independent and platform specific components.This feature allows developers to reuse platform specific components when they build a new system. Moreover, the approach may also be used when they maintain an existing system.