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The Open Grid Services Architecture (OGSA) is a specification for a grid computing environment for business and scientific use. OGSA is based on several other web service technologies, notably WSDL and SOAP. The OGSA specification is implemented in the Globus Toolkit 3 framework. You can download it for free from the .
The OGSA specification is given in the paper "The Physiology of the Grid" by Ian Foster, Carl Kesselman, Jeffrey M. Nick, and Steven Tuecke.