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At a high level of abstraction Grid applications are commonly specified based on the workflow paradigm. This paper considers that for the wide acceptance of Grid technology it is relevant that the user has the possibility to express requirements on Quality of Service (QoS) at workflow specification time. However, most of the existing workflow languages lack constructs for QoS specification, or provide only limited QoS support. In this paper the authors present an approach for high level workflow specification that considers a comprehensive set of QoS requirements.
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