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<title>Tracker Ontology Reference Manual: Part I. Overview</title>
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<div class="titlepage"><div><div><h1 class="title">
<a name="ontology"></a>Part I. Overview</h1></div></div></div>
<div class="partintro">
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<p>
<a class="ulink" href="http://www.tracker-project.org" target="_top">Tracker</a> is a central repository of user information, that provides two big benefits for the desktop: <span class="emphasis"><em>Share</em></span> data between applications (it doesn't matter the source once it is stored in the repository) and <span class="emphasis"><em>Link</em></span> information from different sources (mixing contacts with files, location, activities and whatnot).
</p>
<p>
This central repository can work only with a very well defined data model, that applications can rely to store and recover their information. That data model is defined using a semantic web artifact called <span class="emphasis"><em>ontology</em></span>. An ontology defines the concepts (classes) and properties (attributes) that the items in the repository can be/have.
</p>
<p>
There is an EU-funded project called <a class="ulink" href="http://nepomuk.semanticdesktop.org/" target="_top">Nepomuk</a>, where a core of ontologies to model the Desktop were defined. This set was a very good starting point for Tracker but new requirements and heavy development in collaboration with applications provided a very valuable feedback, in form of fixes and extensions. Some of this work is already submitted for approval in the upstream version, but the process is long and hard, so the Tracker ontologies are diverging slowly.
</p>
<p>
This documentation describes the Tracker flavour of Nepomuk ontologies. The big picture and basic concepts are the same as in the original Nepomuk, but "hell and heaven are in the details". All classes, properties and restrictions included in these pages should work in Tracker. Any error in this documentation can be reported in the Tracker <a class="ulink" href="http://mail.gnome.org/mailman/listinfo/tracker-list" target="_top">Mailing list</a> or <a class="ulink" href="https://bugzilla.gnome.org/enter_bug.cgi?product=tracker" target="_top">bugzilla</a>.
</p>
<p>
This is just documentation about the ontologies. For more information about Tracker technical details and implementation, please refer to the Tracker <a class="ulink" href="http://live.gnome.org/Tracker/Documentation/" target="_top">Documentation wiki</a> page in GNOME.
</p>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl class="toc">
<dt><span class="chapter"><a href="xsd-ontology.html">XML schema (XSD): Basic types definitions (int, double,...)</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="xsd-ontology.html#xsd-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="xsd-classes.html">XSD Ontology Classes</a></span></dt>
<dt><span class="section"><a href="xsd-properties.html">XSD Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="rdf-ontology.html">Resource Description Framework (RDF): Core RDF classes to keep the internal consistency of the ontology</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="rdf-ontology.html#rdf-classes">RDF Ontology Classes</a></span></dt>
<dt><span class="section"><a href="rdf-properties.html">RDF Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="dc-ontology.html">Dublin Core metadata (DC): Common superproperties for documents</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="dc-ontology.html#dc-classes">DC Ontology Classes</a></span></dt>
<dt><span class="section"><a href="dc-properties.html">DC Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nie-ontology.html">Nepomuk Information Element (NIE): Top classes in the ontology. Almost everything else is subclass of these.</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nie-ontology.html#nie-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="nie-classes.html">NIE Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nie-properties.html">NIE Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nao-ontology.html">Nepomuk Annotation Ontology (NAO): Tags, ratings and other common annotations to all classes</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nao-ontology.html#nao-classes">NAO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nao-properties.html">NAO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nfo-ontology.html">Nepomuk File Ontology (NFO): About files and other desktop resources.</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nfo-ontology.html#nfo-classes">NFO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nfo-properties.html">NFO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nco-ontology.html">Nepomuk Contacts Ontology (NCO): All about contacts. Rough equivalent of the VCARD standard.</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nco-ontology.html#nco-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="nco-classes.html">NCO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nco-properties.html">NCO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nmo-ontology.html">Nepomuk Messaging Ontology (NMO): Model for messages and communications, including Email, SMS, MMS and phone calls</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nmo-ontology.html#nmo-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="nmo-classes.html">NMO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nmo-properties.html">NMO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="ncal-ontology.html">Nepomuk Calendar Ontology (NCAL): Automatic translation of the ICAL standard into ontology. Too complex for our taste. Please check SCAL</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="ncal-ontology.html#ncal-classes">NCAL Ontology Classes</a></span></dt>
<dt><span class="section"><a href="ncal-properties.html">NCAL Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="scal-ontology.html">Simplified Calendar Ontology (SCAL): Simple and efficient ontology to represent calendar information (events, ToDos, recurrency rules...)</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="scal-ontology.html#scal-classes">SCAL Ontology Classes</a></span></dt>
<dt><span class="section"><a href="scal-properties.html">SCAL Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="nmm-ontology.html">Nepomuk MultiMedia (NMM): Description of multimedia objects like Music, Video and Images</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="nmm-ontology.html#nmm-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="nmm-classes.html">NMM Ontology Classes</a></span></dt>
<dt><span class="section"><a href="nmm-properties.html">NMM Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="mto-ontology.html">Maemo Transfer Ontology (MTO): Representation of download and upload operations in the system</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="mto-ontology.html#mto-classes">MTO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="mto-properties.html">MTO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="mlo-ontology.html">Maemo Location Ontology (MLO): Deprecated ontology for location and landmarks. Please check SLO</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="mlo-ontology.html#mlo-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="mlo-classes.html">MLO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="mlo-properties.html">MLO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="mfo-ontology.html">Maemo Feeds Ontology (MFO): Model for feeds and alike online streams</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="mfo-ontology.html#mfo-explanation">Overview</a></span></dt>
<dt><span class="section"><a href="mfo-classes.html">MFO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="mfo-properties.html">MFO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="mtp-ontology.html">Multimetida Transfer Protocol (MTP) Ontology: Extra properties to add MTP information to the objects in the ontology</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="mtp-ontology.html#mtp-classes">MTP Ontology Classes</a></span></dt>
<dt><span class="section"><a href="mtp-properties.html">MTP Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="slo-ontology.html">Simplified Maemo Location Ontology (SLO) (experimental/for testing): Simpler, faster, better ontology for locations and landmarks</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="slo-ontology.html#slo-classes">SLO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="slo-properties.html">SLO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="tracker-ontology.html">Tracker-specific annotations Ontology: Internal tracker properties</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="tracker-ontology.html#tracker-classes">TRACKER Ontology Classes</a></span></dt>
<dt><span class="section"><a href="tracker-properties.html">TRACKER Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="maemo-ontology.html">Maemo-specific classes: Some maemo/meego specific properties</a></span></dt>
<dd><dl>
<dt><span class="section"><a href="maemo-ontology.html#maemo-classes">MAEMO Ontology Classes</a></span></dt>
<dt><span class="section"><a href="maemo-properties.html">MAEMO Ontology Properties</a></span></dt>
</dl></dd>
<dt><span class="chapter"><a href="fts-properties.html">Full-text indexed properties in the ontology</a></span></dt>
</dl>
</div>
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