CS4624 HARD94

Hardman, Bulterman, van Rosum: pages (v37/n02/HARD94)
The Amsterdam Hypermedia Model: Adding Time and Context to the Dexter Model


On the surface, hypermedia is a simple and natural extension of multimedia and hypertext: multimedia provides a richness in data types that facilitates flexibility in expressing information, while hypertext provides a control structure that supports an elegant way of navigating through this data in a content based manner. Unfortunately, the concepts that apply to collections of static information do not all translate well to complex collections of dynamic informatlon. What does it mean, for example, to follow a Iink in a hypermedia presentation when the source node consists of nonpersistent data? Does the source presentation freeze, does it go away, do parts of it go away? Similarly, how should the synchronizatlon relationships within and among elements in a composite component be defined? Is this part of the hypermedia model or part of a data storage or data presentation model? In our view, a general hypermedia model needs to he able to specify both the conventional Iink based navigation elements oF hypertext and the complex timing and presentation relationships found in multimedia presentations. Such a model is presented here.

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Copyright 1996 Edward A. Fox