The platform of Grid open architecture oriented services– OGSA was created from the common vision of Globus and IBM to converge Web Services technologies with Grid computational technologies. OGSA adopts the services oriented architecture (SOA) to expose the Grid functionalities as collections of software elements oriented for services. OGSA provides a set of extensible services which virtual organizations can aggregate in various ways, offering a holistic vision on Grid technologies and incorporating the open standards benefits (including W3C). The authors of OGSA architecture mention the fact that the vision was that of transforming the Grid in a “extensible set