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Real-time software systems encountered in telecommunications, aerospace, and defense often tend to be very large and extremely complex. It is crucial in such systems that the software has a well-defmed architecture. This not only facilitates construction of the initial system, it also simplifies system evolution. We describe a set of modeling constructs that facilitate the specification of complex software architectures for real-time systems. These constructs are derived from field-proven concepts originally defined in the ROOM modeling language. Furthermore, we show how they can be represented using the industry-standard Unified Modeling Language (UML) by using the powerful extensibility mechanisms of UML.

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