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From Open Grid Services Infrastructure to WSResource Framework: Refactoring & Evolution

K. Czajkowski, D. Ferguson, I. Foster, J. Frey, S. Graham, T. Maguire, D. Snelling, S. Tuecke

The Open Grid Services Infrastructure specification version 1.0 (OGSI), released in July 2003, defines a set of conventions and extensions on the use of Web Service Definition Language and XML Schema to enable stateful Web services. It introduces the idea of a stateful Web services and defines approaches for creating, naming, and managing the lifetime of instances of services; for declaring and inspecting service state data; for asynchronous notification of service state change; for representing and managing collections of service instances; and for common handling of service invocation faults. In January 2004, the WS-Resource Framework was proposed as a refactoring and evolution of OGSI aimed at exploiting new Web services standards, specifically WS-Addressing, and at evolving OGSI based on early implementation and application experiences. The WS-Resource Framework retains essentially all of the functional capabilities present in OGSI, while changing some of the syntax (e.g., to exploit WS-Addressing) and also adopting a different terminology in its presentation. In addition, the WS-Resource Framework partitions OGSI functionality into five distinct, composable specifications. In this document, we explain the relationship between OGSI and the WS-Resource Framework and the related WS-Notification family of specifications, explain the common requirements that both address, and compare and contrast the approaches taken to the realization of those requirements.
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