The Tao Of Topic Maps / quote 25 of 27
Topics, associations and occurrences
The key features of a typical index are thus: topics (identified by their names, of which there may be more than one); associations between topics; and occurrences of topics (pointed to via locators). For each of these constructs it is useful to be able to say something about the type, in order to convey more information to the user. Topics, Associations and Occurrences are also the key constructs in the topic map model