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<title>Tracker Ontology Reference Manual: Maemo Location Ontology (MLO): Deprecated ontology for location and landmarks. Please check SLO</title>
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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="mlo-ontology"></a>Maemo Location Ontology (MLO): Deprecated ontology for location and landmarks. Please check SLO</h2></div></div></div>
<div class="toc"><dl class="toc">
<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></div>
<dt><span class="term">Authors:</span></dt>
<dd><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Ivan Frade <ivan.frade@nokia.com></li></ul></div></dd>
<dt><span class="term">Editors:</span></dt>
<dd><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Ivan Frade <ivan.frade@nokia.com></li></ul></div></dd>
<dt><span class="term">Upstream:</span></dt>
<dd><p>Not available</p></dd>
<dt><span class="term">ChangeLog:</span></dt>
<dd><p><a class="ulink" href="http://git.gnome.org/cgit/tracker/log/data/ontologies/40-mlo.ontology" target="_top">Tracker changes</a></p></dd>
<dt><span class="term">Copyright:</span></dt>
<dd><p>© 2009, 2010 <a class="ulink" href="http://www.nokia.com/" target="_top">Nokia</a></p></dd>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="mlo-explanation"></a>Overview</h2></div></div></div>
<div class="refsect2">
<a name="mlo-introduction"></a><h3>Introduction</h3>
<p>This is the proposed ontology to integrate geolocation information in the nepomuk set of ontologies. It defines a place in the space with the class <a class="link" href="mlo-classes.html#mlo-GeoLocation" title="mlo:GeoLocation">mlo:GeoLocation</a>. A place can be defined in different ways:</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><p>
As a Box (using the class <a class="link" href="mlo-classes.html#mlo-GeoBoundingBox" title="mlo:GeoBoundingBox">mlo:GeoBoundingBox</a> and the property <a class="link" href="mlo-properties.html#mlo-asBoundingBox" title="mlo:asBoundingBox">mlo:asBoundingBox</a>)
</p></li>
<li class="listitem"><p>
As a point with coordinates (using the class <a class="link" href="mlo-classes.html#mlo-GeoPoint" title="mlo:GeoPoint">mlo:GeoPoint</a> and the property <a class="link" href="mlo-properties.html#mlo-asGeoPoint" title="mlo:asGeoPoint">mlo:asGeoPoint</a>) as a single point in the space with its coordinates
</p></li>
<li class="listitem"><p>
As a postal address, with the text description (using the class <a class="link" href="nco-classes.html#nco-PostalAddress" title="nco:PostalAddress">nco:PostalAddress</a> from <a class="link" href="nco-ontology.html" title="Nepomuk Contacts Ontology (NCO): All about contacts. Rough equivalent of the VCARD standard.">NCO ontology</a> and the property <a class="link" href="mlo-properties.html#mlo-asPostalAddress" title="mlo:asPostalAddress">mlo:asPostalAddress</a>)
</p></li>
</ol></div>
<p>These three representations are not exclusive, but is responsability of the applications to keep the data consistent.</p>
<p>Some places in the space has an special meaning, E.G. premises, buildings or services. This fact is represented in the ontology with the class <a class="link" href="mlo-classes.html#mlo-Landmark" title="mlo:Landmark">mlo:Landmark</a>. The title and description of the Landmark itself can be set using the <a class="link" href="nie-classes.html#nie-InformationElement" title="nie:InformationElement">nie:InformationElement</a> properties (<a class="link" href="nie-properties.html#nie-title" title="nie:title">nie:title</a>, <a class="link" href="nie-properties.html#nie-description" title="nie:description">nie:description</a>, ...). A location is linked with a landmark with the property <a class="link" href="mlo-properties.html#mlo-location" title="mlo:location">mlo:location</a> inherited from the superclass Information Element.</p>
<p>Landmark can be grouped in categories. For this reason, the ontology provides a property <a class="link" href="mlo-properties.html#mlo-belongsToCategory" title="mlo:belongsToCategory">mlo:belongsToCategory</a> that links a Landmark with the class <a class="link" href="mlo-classes.html#mlo-LandmarkCategory" title="mlo:LandmarkCategory">mlo:LandmarkCategory</a> . The ontology includes also a predefined set of instances, very common an a de-facto standard in the industry.</p>
</div>
<hr>
<div class="refsect2">
<a name="mlo-considerations"></a><h3>Considerations</h3>
<p>A <a class="link" href="mlo-classes.html#mlo-Landmark" title="mlo:Landmark">mlo:Landmark</a> is linked with its location using the property <a class="link" href="mlo-properties.html#mlo-location" title="mlo:location">mlo:location</a>, inherited from its superclass <a class="link" href="nie-classes.html#nie-InformationElement" title="nie:InformationElement">nie:InformationElement</a>.</p>
<p>All classes in the ontology are subclasses of <a class="link" href="nie-classes.html#nie-InformationElement" title="nie:InformationElement">nie:InformationElement</a>. It is not indicated in the graphic for the sake of clarity.</p>
<p>The three possible representations of a location (i.e. <a class="link" href="mlo-classes.html#mlo-GeoPoint" title="mlo:GeoPoint">mlo:GeoPoint</a>, <a class="link" href="mlo-classes.html#mlo-GeoBoundingBox" title="mlo:GeoBoundingBox">mlo:GeoBoundingBox</a>, <a class="link" href="nco-classes.html#nco-PostalAddress" title="nco:PostalAddress">nco:PostalAddress</a>) are <span class="emphasis"><em>properties</em></span> (and <span class="emphasis"><em>not subclasses</em></span>) of the location object (instance of <a class="link" href="mlo-classes.html#mlo-GeoLocation" title="mlo:GeoLocation">mlo:GeoLocation</a>).</p>
</div>
<hr>
<div class="refsect2">
<a name="mlo-comments"></a><h3>Contract with applications</h3>
<p>We want to put special emphasis in the point that the applications must keep the different representations of the points consistent. Basically a point in the space is very unlikely to change (the point is there or not), but it is not difficult to assume that some application can complete the information, taking the postal addresses of the points without coordinates, and set the coordinates using some web service.</p>
<p>A box is considered as a <span class="emphasis"><em>2 dimensions</em></span> area orientated to the north, aligned to parallels and meridians. The area is defined with two points: the southern east point (down left corner, in the <a class="link" href="mlo-properties.html#mlo-bbSouthEast" title="mlo:bbSouthEast">mlo:bbSouthEast</a> property) and northern western point (upper right corner, in the <a class="link" href="mlo-properties.html#mlo-bbNorthWest" title="mlo:bbNorthWest">mlo:bbNorthWest</a> property).</p>
<p><a class="link" href="mlo-classes.html#mlo-LandmarkCategory" title="mlo:LandmarkCategory">mlo:LandmarkCategory</a> has a property <a class="link" href="mlo-properties.html#mlo-isRemovable" title="mlo:isRemovable">mlo:isRemovable</a> to mark is the category is predefined and shouldn't be deleted by the applications. Tracker (and probably other backends) doesn't enforce applications to respect this value, but consider it a gentleman agreement.</p>
</div>
<hr>
<div class="refsect2">
<a name="mlo-graphical-overview"></a><div class="figure">
<a name="mlo-ontology-graph"></a><p class="title"><b>Figure 7. Graphical Overview</b></p>
<div class="figure-contents"><div><img src="location-overview.png" alt="Graphical Overview"></div></div>
</div>
<br class="figure-break"><p>Notation defined <a class="link" href="ontology-notation-description.html#ontology-notation" title="Figure 9. Notation for ontology description">in this page</a></p>
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