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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" type="topic" id="tech-tracker" xml:lang="sv">
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<info>
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<link type="guide" xref="tech" group="tracker"/>
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<credit type="author copyright">
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<name>Federico Mena Quintero</name>
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<email its:translate="no">federico@gnome.org</email>
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<years>2013</years>
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</credit>
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<include xmlns="http://www.w3.org/2001/XInclude" href="cc-by-sa-3-0.xml"/>
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<desc>Storage and retrieval for document metadata</desc>
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</info>
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<title>Tracker</title>
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Tracker is an RDF (resource data format) storage engine. RDF consists of
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triplets such as subject:verb:object. For example, there could be
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standard triplets for book titles and authors, such as
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Othello:has-author:William Shakespeare . A standardized set of
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triplet forms is called an ontology.
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Tracker provides a storage for such triplets, and a query engine in the
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form of the SPARQL query language.
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GNOME uses Tracker as a storage for document metadata. A document's
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metadata may include its title, authors, copyright, modification date, and
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keywords. All this metadata is stored as RDF triplets in Tracker, and
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queried with SPARQL by applications such as GNOME Documents. The
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<link href="http://developer.gnome.org/ontology/unstable/">ontology
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used</link> is based on various standard sub-ontologies:
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<link href="http://dublincore.org/">Dublin Core</link> for document metadata,
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and <link href="http://nepomuk.kde.org/">NEPOMUK</link> for annotations,
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files, contacts and other items.
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<list style="compact">
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<item><link href="https://wiki.gnome.org/Projects/Tracker">Tracker Home Page</link> </item>
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<item><link href="https://wiki.gnome.org/Projects/Tracker/Documentation">Tracker documentation</link> </item>
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</list>
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</page>
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