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The document discusses and compares different architectural styles for distributed systems, focusing on Web Services, REST, and Instant Messaging. It summarizes the requirements for grid computing including scalability, interoperability, pervasiveness, and network efficiency. It then provides details on the Web Services Architecture (WSA) and related WS-* standards, and how they have been used to implement grid computing. It also describes the constraints-based Representational State Transfer (REST) architectural style and compares it to the less constrained WSA.



















































