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A Hypertext Database for Advanced Sharing of Distributed Web Pages
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T. Yamakita and
T. Fuji
View Paper (PDF)
Return to Poster Session 1: WWW, Integration, Workflow
There are many learning systems using their web pages. These systems provide not only contents of the web pages but also the embedded links on them for learners. In these systems, since the learners can use all the hyperlinks embedded on the web page, they can visit unnecessary/invalid web pages.
In order to use web pages as instructional materials, authors of instructional materials need to be able to select appropriate web pages. Moreover, it is necessary to provide only the hyperlinks among these selected pages.
A hyperlink view means the network of these selected web pages and hyperlinks. We regard this style of reusing web pages based on the hyperlink view as the advanced sharing of them. For the purpose of constructing a hypertext database that supports above advanced sharing of web pages, we developed an object- oriented framework of hypertext database. This framework is an extension of the Dexter model by adding link-context layer, context selecting interface, and more detailed presentation specifications to it. Material Authors can create their own hyperlink views and store each view in the hypertext database as a new link context individually. As the context selecting interface accomplishes composition of some link contexts, they can extend their link contexts. In this framework, a unit for sharing of web pages is a link context.
It is necessary to hide hotspots about invalid hyperlinks on a screen dynamically. We add hiding mechanism of the invalid hotspots to the Dexter model. It is possible to treat hyperlink views through an ordinary web browsers. We developed a prototypical instructional material database, that is an example of the applications of our framework. Through this experience, we confirmed that the advanced sharing of web pages and their hyperlinks reduced the cost of material developments.
Copyright(C) 2000 ACM
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