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In recent years, what are called middleware systems have gained increasing attention both from academia and from the practice field. Middleware systems are an additional layer above the operating system that allows for a higher level of platform independence and fosters the integration of application systems. Typical instances of middleware systems are web servers, application servers, DBMS, workflow management systems, or component technologies.

In order to support the evaluation of middleware systems, we develop specialized frameworks. We also produce abstractions that allow us to describe elaborate models of corresponding architectures. Such abstractions can be used for the development of systems that make use of middleware technologies, e.g. component-oriented architectures. With the Mobilo project, we have implemented a middleware framework for developing portable workflow management systems in distributed heterogeneous environments.