In search of the unknown user: indexing, hypertext and the world wide web

For the purposes of this article, the indexing of information is interpreted as the pre-processing of information in order to enable its retrieval. This definition thus spans a dimension extending from classification-based approaches (pre-co-ordinate) to keyword searching (post-co-ordinate). In the first section we clarify our use of terminology, by briefly describing a framework for modelling IR systems in terms of sets of objects, relationships and functions. In the following three sections, we discuss the application of indexing functions to document collections of three specific types: (1) ‘conventional’ text databases; (2) hypertext databases; and (3) the World Wide Web, globally distributed across the Internet.