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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="creating-ontology"></a>Creating an ontology</h2></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="section"><a href="creating-ontology.html#defining-namespaces">Defining a namespace</a></span></dt>
<dt><span class="section"><a href="defining-classes.html">Defining classes</a></span></dt>
<dt><span class="section"><a href="defining-properties.html">Defining properties</a></span></dt>
<dt><span class="section"><a href="defining-cardinality.html">Defining cardinality of properties</a></span></dt>
<dt><span class="section"><a href="defining-uniqueness.html">Defining uniqueness</a></span></dt>
<dt><span class="section"><a href="defining-indexes.html">Defining indexes</a></span></dt>
<dt><span class="section"><a href="defining-fts-indexes.html">Defining full-text search properties</a></span></dt>
<dt><span class="section"><a href="predefined-elements.html">Predefined elements</a></span></dt>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="defining-namespaces"></a>Defining a namespace</h2></div></div></div>
<p>
A namespace is the topmost layer of an individual ontology, it will
contain all classes and properties defined by it. In order to define
a namespace you can do:
</p>
<pre class="programlisting"># These prefixes will be used in the definition of the ontology,
# thus must be explicitly defined
@prefix nrl: <http://www.semanticdesktop.org/ontologies/2007/08/15/nrl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix tracker: <http://www.tracker-project.org/ontologies/tracker#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix nao: <http://www.semanticdesktop.org/ontologies/2007/08/15/nao#> .
# This is our example namespace
@prefix ex: <http://example.org/#>
ex: a tracker:Namespace, tracker:Ontology
tracker:prefix "ex"
rdfs:comment "example ontology"
nao:lastModified "2017-01-01T15:00:00Z"
</pre>
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