||Systems for storing and retrieving text documents have been used for many
years in specific application areas, such as libraries, govemmental institutions
and news agencies where the business requires management of large amounts of
textual information.In other sectors the use of text retrieval systems as general tools for information
management has so far been limited. But as the amount of electronically produced text documents has increased drarnatically during the last two decades, systerns for managing large text databases are becoming interesting for most large organisations.