Mediators in the Architecture of Grid Information Systems

Across a wide variety of fields, huge datasets are being collected and accumulated at a dramatical pace. The datasets addressed by individual applica- tions are very often heterogeneous and geographically distributed. In this paper, we describe our extensions and improvements to the reference implementation of the OGSA-DAI Grid Data Service prototype in order to provide a Virtual Data Source - a clean abstraction of heterogeneous/distributed data for users and ap- plications. By picturing general applicable access scenarios we are showing the great need for such a Grid data mediation service as well as the compliance with important requirements of virtual data sources.

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