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A UML extension of distributed system

UML provides a lack of efficient support for distributed features. This paper provides an extension of UML to solve this problem. The extension changes the use case diagram to be active and multi-level for requirement engineering of distributed systems, and adds control of time and support for the complex message mechanism in order to model the distributed applications associated with real-time and multimedia systems. The ideas derived from the paper are of interest to software engineering over the Internet.