Moving digital library service systems to the Grid

The architecture of a digital library service system strongly influences its capabilities. In this paper we report on our experience with a distributed digital library system, OpenDLib, and we describe why, in the attempt to better satisfy the user requirements, we decided to develop DILIGENT, a service-oriented digital library infrastructure on the Grid. The paper describes and compare the two systems by focusing, in particular, on that part of the architecture that controls and supplies the necessary features for creating and managing digital libraries.