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<h1 class="title">What is Jena?</h1>
<p>Jena is a Java framework for building Semantic Web applications. It provides a
extensive Java libraries for helping developers develop code that
handles RDF, RDFS, RDFa, OWL and SPARQL in line with
published <a href="https://www.w3.org/2001/sw/">W3C recommendations</a>.
Jena includes a rule-based inference engine
to perform reasoning based on OWL and RDFS ontologies, and a variety of storage
strategies to store RDF <em>triples</em> in memory or on disk.</p>
<h3 id="history">History</h3>
<p>Jena was originally developed by researchers in <a href="https://www.hpl.hp.com">HP Labs</a>,
starting in Bristol, UK, in 2000. Jena has always been an open-source project,
and has been extensively used in a wide variety of semantic web applications and
demonstrators. In 2009, HP decided to refocus development activity away from direct
support of development of Jena, though remaining supportive of the project&rsquo;s aims.
The project team successfully applied to have Jena adopted by the Apache
Software Foundation
in November 2010 (see the <a href="https://mail-archives.apache.org/mod_mbox/incubator-general/201011.mbox/%3C4CEC31E4.9080401@apache.org%3E">vote result</a>).</p>
<h3 id="current-status">Current status</h3>
<p>Jena entered incubation with the Apache in November 2010, and graduated as a top-level
project in April 2012.</p>
<h3 id="thanks">Thanks</h3>
<p>YourKit is kindly supporting open source projects with its full-featured Java Profiler.
YourKit, LLC is the creator of innovative and intelligent tools for profiling
Java and .NET applications. Take a look at YourKit&rsquo;s leading software products:
<a href="https://www.yourkit.com/java/profiler/index.jsp">YourKit Java Profiler</a> and
<a href="https://www.yourkit.com/.net/profiler/index.jsp">YourKit .NET Profiler</a>.</p>
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