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Middleware systems have emerged in recent years to support applications in heterogeneous and ubiquitous computing environments. Specifically, future middleware platforms are expected to provide quality of service support, which is required by a new generation of QoS-sensitive applications such as media streaming and e-commerce. This article presents four key aspects of a QoS-aware middleware system: QoS specification to allow description of application behavior and QoS parameters; QoSdoi:10.1109/35.965372 fatcat:kskzrwqisrexhlp4xhrvwufhmu