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<div class="section" id="extensions">
<span id="id1"></span><h1>Extensions<a class="headerlink" href="#extensions" title="Permalink to this headline">¶</a></h1>
<p>SQLite includes a number of extensions providing additional
functionality. All extensions are disabled by default and you need to
take steps to have them available at compilation time, to enable them
and then to use them.</p>
<div class="section" id="fts3-4">
<span id="ext-fts3"></span><h2>FTS3/4<a class="headerlink" href="#fts3-4" title="Permalink to this headline">¶</a></h2>
<p>This is the third version of the <a class="reference external" href="https://sqlite.org/fts3.html">full text search</a> extension. It
makes it easy to find words in multi-word text fields. You must
enable the extension via <a class="reference internal" href="build.html#setup-build-flags"><span class="std std-ref">setup.py build flags</span></a> before it will work. There are no additional
APIs and the <a class="reference external" href="https://sqlite.org/fts3.html">documented SQL</a> works as is.</p>
<p>Note that FTS4 is some augmentations to FTS3 and are enabled whenever
FTS3 is enabled as described in the <a class="reference external" href="https://sqlite.org/fts3.html#fts4">documentation</a></p>
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<div class="section" id="icu">
<span id="ext-icu"></span><h2>ICU<a class="headerlink" href="#icu" title="Permalink to this headline">¶</a></h2>
<p>The ICU extension provides an <a class="reference external" href="http://en.wikipedia.org/wiki/International_Components_for_Unicode">International Components for Unicode</a>
interface, in particular enabling you do sorting and regular
expressions in a locale aware way. The <a class="reference external" href="https://sqlite.org/src/finfo?name=ext/icu/README.txt">documentation</a>
shows how to use it.</p>
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<div class="section" id="rtree">
<span id="ext-rtree"></span><h2>RTree<a class="headerlink" href="#rtree" title="Permalink to this headline">¶</a></h2>
<p>The RTree extension provides a <a class="reference external" href="http://en.wikipedia.org/wiki/R-tree">spatial table</a> - see the <a class="reference external" href="https://sqlite.org/rtree.html">documentation</a>.
You must enable the extension via <a class="reference internal" href="build.html#setup-build-flags"><span class="std std-ref">setup.py build flags</span></a> before it will work. There are no additional
APIs and the <a class="reference external" href="https://sqlite.org/rtree.html">documented SQL</a>
works as is.</p>
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<li><a class="reference internal" href="#fts3-4">FTS3/4</a></li>
<li><a class="reference internal" href="#icu">ICU</a></li>
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