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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="external-extensions"></a>H.2.Extensions</h2></div></div></div>
<a name="id903146"></a><p> <span class="productname">PostgreSQL</span> was designed from the start to be
extensible. For this reason, extensions loaded into the database can
function just like features that are packaged with the database. The
<code class="filename">contrib/</code> directory shipped with the source code
contains a large number of extensions. The <code class="filename">README</code> file
in that directory contains a summary. They include conversion tools,
full-text indexing, <acronym class="acronym">XML</acronym> tools, and additional data types
and indexing methods. Other extensions are developed independently,
like <span class="application">PostGIS</span>. Even <span class="application">PostgreSQL</span>
replication solutions are developed externally. For example,
<span class="application">Slony-I</span> is a popular master/slave replication solution
that is developed independently from the core project.
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<p> There are several administration tools available for
<span class="productname">PostgreSQL</span>. The most popular is
<span class="application">pgAdmin</span>, and there are several commercially
available ones.
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