Often there are sets of single HTML pages which can be conceived of as one document. Here it is up to the user to determine the reading order. Often there is no aid to find a contents-based logical order to visit related documents. Therefore, authors sometimes include special hyperlinks to support the reader's navigation (e.g., a next page link).
A good example is the tool 2html[9]. This HTML-page your are reading now was generated using this tool.
document.
At the same time, several links are added to support the hierarchical
structure of the
document in addition to the references already
present in the base text.
These additional links, however, do not belong to the actual
document: They are a navigational aid only, and they have the
disadvantage that they have scrolled off by the time they are needed.
It seems to be more
natural for this type of navigation support to be the task of
a navigation tool like WebMap.
Other hypertext systems (like the GNUinfo system [16]) support a hierarchical document structure by default. But this is a restriction for document authors-admittedly often useful from a reader's point of view-which prevents them from finding a more suitable document structure or to provide no structure at all (besides the hyperlinks).