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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'
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