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<p>in the <a href="page.php?w=inverted_index">inverted index</a> and where subsequently ranking models are applied to retrieve the most relevant documents. Only tokens are defined in the CFG. Web search engines often use this approach.<br/>
* <b>Boolean</b>. A query language that also supports the use of the <a href="page.php?w=logical_connective">Boolean operator</a>s AND, OR, NOT. <br/>
* <b>Structured</b>. A language that supports searching within (a combination of) fields when a document is structured and has been indexed using its document</p><p>
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