Contextual Query Language

<h2 id="examples-of-query-syntax">Examples of query syntax</h2>
<p>Simple queries:
</p>
dinosaur 
"complete dinosaur"
title = "complete dinosaur"
title exact "the complete dinosaur"

dinosaur or bird
Palomar assignment and "ice age"
dinosaur not reptile
dinosaur and bird or dinobird
(bird or dinosaur) and (feathers or scales)
"feathered dinosaur" and (yixian or jehol)

<p>Queries accessing <a href="/facts/Index_(publishing)/amN9DI6s">publication indexes</a>:
</p>
publicationYear < 1980
lengthOfFemur > 2.4
bioMass >= 100

<p>Queries based on the proximity of words to each other in a document:
</p>
ribs prox/distance<=5 chevrons
ribs prox/unit=sentence chevrons
ribs prox/distance>0/unit=paragraph chevrons

<p>Queries across multiple <a href="/facts/Dimension_(data_warehouse)/TQQANKl1">dimensions</a>:
</p>
date within "2002 2005"
dateRange encloses 2003

<p>Queries based on <a href="/facts/Relevance_(information_retrieval)/0kkQ6B9A">relevance</a>:
</p>
subject any/relevant "fish frog"
subject any/rel.lr "fish frog"

<p>The latter example specifies using a specific <a href="/facts/Algorithm/fnl5NmRt">algorithm</a> for <a href="/facts/Logistic_regression/mGj6mc8y">logistic regression</a>.<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a>
</p>

<h2 id="external-links">External links</h2>
<ul><li><a href="https://www.loc.gov/standards/sru/cql/">Official website</a> </li>
<li><a href="https://www.loc.gov/z3950/agency/">Z39.50 Maintenance Agency</a> at the Library of Congress</li>
<li><a href="http://zing.z3950.org/cql/intro.html">A Gentle Introduction to CQL</a></li></ul>

<p> This article incorporates <a href="/facts/Copyright_status_of_works_by_the_federal_government_of_the_United_States/Q1jvr96g">public domain material</a> from the <a href="https://www.loc.gov/standards/sru/cql/">United States government</a>
</p>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>CQL: the Contextual Query Language: Specifications SRU: Search/Retrieval via URL, Standards, Library of Congress <a href="https://www.loc.gov/standards/sru/cql/spec.html" target="_blank">https://www.loc.gov/standards/sru/cql/spec.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
<li id="fn:2"><p>Relevance Ranking Context Set version 1.1 Archived 2011-05-15 at the Wayback Machine <a href="http://srw.cheshire3.org/contextSets/rel/" target="_blank">http://srw.cheshire3.org/contextSets/rel/</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li>
</ol>

Contextual Query Language open-in-new

Contextual Query Language