Query Language

The text search engine allows queries to be formed from arbitrary Boolean expressions containing the keywords AND, OR, and NOT, and grouped with parentheses. For example:

• information retrieval
  finds documents containing 'information' or 'retrieval'
   
• information or retrieval
  same as above
   
• information and retrieval
  finds documents containing both 'information' and 'retrieval'
   
• information not retrieval
  finds documents containing 'information' but not 'retrieval'
   
• (information not retrieval) and WAIS
  finds documents containing 'WAIS', plus 'information' but not 'retrieval'
   
• web*
  finds documents containing words starting with 'web'