This paper provides the context for a deeper understanding of services and service-oriented architectures for enterprise-scale software solutions. Interface-based design is highlighted as the key to both service and component design, and it is argued that the interfaces exposed by both have certain constraints and criteria that distinguish them. The Unified Modeling Language (UML) is used as a tool to describe both logical and implementation designs, as well as specific patterns for both component and service design. Finally, the paper focuses on Web services as a vehicle for exploring issues related to the implementation of services in general.
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