The Grid Data Source Engine batch query system

The interest in grid-databases integration has been steadily increasing in recent years and several projects provided different grid middleware components or tools trying to face this challenge. Among them the Grid Data Source Engine is offering native access to relational and non-relational data sources in a grid environment. In this paper we present its asynchronous query mechanism and we focus on the ability of this GSI/VOMS based middleware component to be integrated in workflow management systems.