RETRIEVAL AND DELIVERY OF INFORMATION IN MULTIMEDIA DATABASE-SYSTEMS

EVA is a multimedia database system capable of storage, retrieval, man agement, analysis and delivery of objects of various media types, incl uding text, audio, images and moving pictures. The interrace language deals with the temporal and spatial aspects of multimedia information retrieval and delivery, in addition to the usual capabilities provided by the ordinary database languages. EVA has rive classes of operation s, namely: operations for querying and updating (i.e. editing) the mul timedia information, operations for screen management, temporal operat ors, operators for specifying rules and constraints, and aggregation ( computational) operators. EVA, an extension of the query language Varq a, is a functional language whose notation is based on that of convent ional set theory. It is formally defined in an algebraic framework. EV A is object oriented and supports objects, object classes, attributes and methods of objects, -and relationships between objects. The curren t implementation of EVA runs on several different platforms.