Bruza proposed measures to determine the effectiveness of index expressions in the hyperindex. The result of a search may be either a pointer to the first match found, or a scored list of matches. Structural querying is what distinguished information retrieval in hypertext from that in ordinary text databases. GraphLog is a visual language, based on pattern matching in the graph-structure of the hyperdocument. Information retrieval in distributed hypertexts is inherently more complicated.
Global queries are no longer possible.
All search activities have to be done by means of automated browsing. In order to verify whether you have learned enough about information retrieval you must complete a test on IR in hypertext . A lot more information on the subject of information retrieval can be obtained from a course in Nijmegen.