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This paper addresses the usage of UML for requirement specification and design of multimedia systems. It shows how modular specifications of components used in QoS cognizant services increase their potential to reuse. It models common components such as negotiators, monitors, and resource managers using UML models enhanced with OCL constraints. The paper also describes how generic designs can be used to derive schedules for QoS cognizant services. Systems for which quality is an integral aspect of their functional correctness are generally considered Quality of Service (QoS) cognizant systems.
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