As Grid technologies become more mature, tools and methods are needed to enable interoperability and common understanding of the components in different Grid implementations. In this paper, we survey the existing efforts (GLUE, OGSA), and unify them with emerging WWW technologies. We concentrate on modelling the structure of a Grid computing element (CE) and propose a design of a Grid resource broker so that it could make better use of the information about the CEs when user requests some Grid resource or service. We expand our view to consider Grid services and data management, too.
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