A tutorial introduction to data models in general is provided, with particular emphasis on the relational and network models defined by the two proposed ANSI (American National Standards Institute) database language standards. Examples based on the network and relational models include specific syntax and semantics, while examples from the other…

A videodisc system provides a means of storing substantial volumes of pictorial information. Individual pictures and sequences of images may be accessed directly thereby providing many novel approaches to image retrieval and display. When combined with an interactive computer system, a videodisc is able to create a useful tool to aid the…