NLI-Z39.50 tour start
Searching a traditional OPAC
Using expert knowledge and expert languages
(subject terms vs. title terms; controlled vs. uncontrolled vocabularies)
Controlled Vocabulary is unknown to a user
(what are subject terms?)
Formulating Boolean queries is still difficult
(different semantics of AND and OR in formal and in natural language)
Example query:
AUTHOR =
"jackson, peter"
AND
DESCRIPTOR =
expert system*
AND
PUBLISHER =
addison-wesley
AND
PUBLICATION-TIME >=
1995
University of Hagen
,
IICS
,
Johannes.Leveling@fernuni-hagen.de
