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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 Web |
| finds documents containing 'Web', plus 'information' but not 'retrieval' |
| web* |
| finds documents containing words starting with 'web' |
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