In the last few years there have appeared different initiatives for creating workflow environments to be used in grid deployments. This paper analyzes the state of the art of the proposals for workflow applied to grid computing and proposes an alternative providing new features, focusing on multigrid and extensibility capabilities. The workflow system developed is based on the definition of a workflow modelling language named WINGs. The features provided by this language will set the capabilities needed in the execution engine and therefore the functionality of the whole system. A use case in combination with the Fura grid middleware is described to show the functionality of the current development.
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