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One of the concerns voiced about the DexterReferenceModel was the lack of support for emerging MultiMedia systems. The Amsterdam Hypermedia Model (AHM) attempted to address these concerns by marrying the hyperstructures of the DexterReferenceModel with the features of these new systems.
One of the biggest concerns was deciding on how the order of a MultiMedia presentation could be expressed in terms of the DexterReferenceModel. The AHM team needed to be able to include presentation mechanisms such as Collection (where several items are presented together as one) and Synchronisation (where items are presented in an order relative to one another).
Some interesting features of the model:
- Temporal attributes: nodes were expanded to include temporal and other higher level presentation attributes.
- SynchronisationArcs: structures that define the relative ordering of nodes in a composite.
- Channels: abstract devices for defining global presentation attributes. This enabled the same nodes to be presented in different ways simply by choosing a different channel.
- Link context: specific display options could be associated with links (for example, the source node could be retained or replaced when a link was followed). This provided greater control over the display of nodes in the presentation.
- Links in Hypermedia the Requirement for Context
- Linda Hardman, Dick Bulterman, & Guido van Russum, Proceedings of the í93 ACM Conference on Hypertext, 183-191, 1993.
- The Amsterdam Hypermedia Model
- Adding Time and Context to the Dexter Model: Linda Hardman, Dick Bulterman, & Guido van Russum, CommunicationsOfTheAcm, 37, 50ñ63, 1995.