Navigational Help
The hypertext documents in this domain have a hierarchical structure consisting of sections and
subsections. Tools built into these hypertext documents facilitate the navigation
among the sections. Navigation consists of the upward, downward, and across movement in the
hierarchical structure as well as the movement from the hierarchical structure of one domain to
another.
A domain is a structured set of documents pertaining to a particular area
or subject. The domain's structure can be viewed either as an
outline consisting of with sections and subsections or as a tree where its nodes represent sections of the domain.
Two types of navigation tools are used: navigation tools within the text of the document and navigation
tools separated from the body of the document in the form of
a toolbar.
Links Embedded in Text
The hypertext tools embedded in the body of the document
include hypertext links in the form of "hot" text and
graphic images. Links within the domain connect either to subsections or they
connect to topics outside of the current domain. These links are within the text of a document because
they are context sensitive. They depend on the text surrounding them to specify
their meaning and content.
The links contained in the body of the text include graphic
images that identify the type of information that is accessed by the link. They include:
Red images indicate that the link connects to a section or map outside of the current domain.
Toolbar
The connections provided by the toolbar are general navigation links. Unlike the links embedded in
text, the toolbar buttons' characteristics remain constant from domain section to section.
The toolbar is a collection of standard link buttons:
The toolbar allows navigation only within the current domain.
It is located at the bottom of the hypertext page. Not every button in the
toolbar is valid for every page; a button in the
toolbar is "hot" or executable if it has a blue boundary.
Figure 1. Two views of the domain structure using navigational tools.