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This paper describes the requirements and high-level design of a service-oriented architecture for demand- driven e-government. Central to this architecture is the integration of services from different government agencies and private parties to create truly demand- driven e-services to citizens. Starting from a description of the requirements, we give a functional architecture and identify technologies that may be used to realize this functionality. This architecture is the first to combine service orientation, identity management, business process management, and semantic Web technologies to implement this vision of integrated, demand-driven services.