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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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