At a given source, efficient query processing is supported by using materialized views and multidimensional index structures. Finally, we propose solutions to the problem of storage and retrieval of large objects on secondary and tertiary storage. The WWW has a great potential of evolving into a globally distributed digital document library. The primary use of such a library is to retrieve information quickly and easily. Because of the size of these libraries, simple keyword searches often result in too many matches.
More complex searches involving boolean expressions are difficult to formulate and understand.
The goal of this technique is to design an interface for querying structured documents without prior knowledge of the internal structure. An educational digital library is a specialized digital library containing instructional materials, such as class lectures, seminar presentations, and various training materials. These materials consist of the combination of audio, video and image data. We believe that such an environment has diverse uses, including student training, human resource development, and asynchronous distance learning. In this paper, we investigate a framework for supporting the continuous and synchronized presentation of multimedia streams in educational digital libraries.