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Briefly, OGSA is a distributed interaction and computing architecture based around services, assuring interoperability on heterogeneous systems so that different types of resources can communicate and share information. OGSA has been described as a refinement of the emerging Web Services architecture, specifically designed to support Grid requirements.<ref>[http://www.extreme.indiana.edu/~gannon/OGSAanalysis3.pdf An Analysis of The Open Grid Services Architecture]</ref> OGSA has been adopted as a grid architecture by a number of grid projects including the [[Globus Alliance]]. Conceptually, OGSA was first suggested in a seminal paper by [[Ian Foster]] called "The Physiology of the Grid", and later developed by [[Global Grid Forum| GGF]] working groups which resulted in a GGF information document, entitled ''The Open Grid Services Architecture, Version 1.5''.<ref>[http://www.ogf.org/documents/GFD.80.pdf The Open Grid Services Architecture, Version 1.5]</ref> The [[Global Grid Forum]] continues to track Tier 1 use case scenarios used in the definition of the OGSA core services.<ref>[http://www.ogf.org/documents/GFD.29.pdf OGSA Tier 1 Use Case Draft Document]</ref>
According to the [http://www.ogf.org/documents/GFD.53.pdf OGSA Roadmap document], OGSA is:
* An architectural process in which the GGF's OGSA Working Group collects requirements and maintains a set of informational documents that describe the architecture;
* A set of normative specifications and [[Profile (engineering)|profiles]] that document the precise requirements for a conforming hardware or software component;
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