|Table of Contents|
|Table of Contents|
Readers require a search engine that allows for complex searches of entire articles, complex modules and elementary modules. It must be possible to search by:
Once the reader has located the modules of interest, he should be able to print individual modules (automatically including the images and other non-textual but printable parts) as well as any selected collection of modules.
Just as for the traditional scientific article, the modular article, as well as each individual module, is a self-contained representation of scientific information. Therefore, we must keep in mind that many of the same presentation issues that have to be taken into account when writing a traditional article remain valid in the modular case. The internal structure of modules has to be made visible by means of typography, paragraphs and sections. If the reader prefers to print the module on paper, the presentation of the printed version may be adapted to the paper medium.
In addition to the traditional presentation requirements, the modular structure leads to requirements concerning the composition of modules and links. Complex modules, which consist of linked constituent modules and a `module summary' summarising them, should be implemented in a `recognisable' way. For example, the module summary may be presented in a different font or colour than the elementary modules. The exact presentation should not be hardwired into the module, but rather stored in SGML type tags. The presentation then can be managed through the style sheet.
The reader's main requirement concerning the implementation is that the presentation should be flexible. In particular, the reader must be able to unfold or hide:
The distributed presentation obscures the coherence of the information: if the reader does not understand the target and the nature of the links connecting the modules, he cannot make a well-considered choice as to whether to follow the links or not. Therefore, the type of the link must be made explicit as well as its target. Rather than identifying the target with an uninformative identification code, the author name and publication date of the cited module may be made explicit. In addition to the type and the target of the link, a short phrase can provide further clarification. This characterisation should be hidden from view, and only be made visible on demand. For example, the link may be represented in the text by a small icon (different icons may be used to indicate the main function of the link) and the characterisation may be shown in a `pop-up' box when the reader moves his mouse onto the icon.
If a particular point in a module serves as a starting point for more than one link, the various links may be routed via a menu. For example, at a particular feature in the graphical of the results a link may be provided for zooming in on that feature, another for comparison of that feature to a similar feature in another Results module, and a third to its interpretation.
Many explicit links could also make a modular article unreadable. The reader must therefore be able to choose how the links are presented: as elaborate informative icons, as unobtrusive icons, as words, or completely hidden from view. The different types of links should in principle be distinguishable at first glance. Links that have been created to express an organisational relation may be presented using a different colour, font or icon than links created for the different kinds of scientific discourse relations.
Furthermore, the reader requires tools that enable him to:
At all times, the reader of a modular article should have at his disposal the navigation menu of the module at hand, as well as the Map of contents and the Abstract of the article.
In an electronic environment, the map of contents must be interactive: the representations of the modules in the map must be linked to the modules themselves by hyperlinks. The map should also indicate (on demand) which `content module' the reader is currently consulting and which modules he has accessed before (if any). The map of contents must be flexible, because it is too complex to be presented in full detail to the reader. The reader must be able to: