2 Architecture 2 2.1 Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.2 Data-Centric Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.3 Adaptive Routing and Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.4 In-Network Storage . . . . . . . . . . . . . . . . ....

By understanding the semantics of workflows and their data, grid middleware can provide data-centric services that are lacking in currently deployed process-centric grid middleware. We describe GridDB, a grid middleware system that provides data-centric services as well as one example service, computational steering.