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 or retrieval -
same as above
information not retrieval - finds documents containing 'information'
but not 'retrieval'
(information not retrieval) and WAIS
- finds documents containing 'WAIS', plus
'information' but not 'retrieval'
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