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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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