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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:
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information
retrieval
finds documents containing 'information' or
'retrieval'
information
or retrieval
same as above
information
and retrieval
finds documents containing both 'information'
and 'retrieval'
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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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