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In 1992 researchers at the University of Aarhus, Denmark decided to build a new hypertext system based on the DexterReferenceModel, both to prove its validity and demonstrate its flaws. The result was the Devise Hypermedia (DHM) system, an open and extensible architecture based around an object-oriented database.
The major deviation from the DexterReferenceModel in DHM was the inclusion of DanglingLinks. The DHM team pointed out that this was a natural extension of the DexterReferenceModel, and had the advantages of allowing users to construct links incrementally, and enabling 'lazy' updating and garbage collection when nodes were deleted from the hypertext.
Another interesting aspect of the DHM project was the exploration of LinkDirectionality:
Although the DexterReferenceModel allows for the specification of LinkDirectionality, it does not explain which of these notions should actually be assumed. The DHM team specified that all links would be bi-directional at creation, but that the user could modify the directionality if they wished.
See Also:
(--TimMilesBoard)
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-- Last edited October 27, 2002 |
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