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<a name="defining-classes"></a>Defining classes</h2></div></div></div>
<p>
Classes are the base of an ontology, all stored resources must define
themselves as "being" at least one of these classes. They all derive
from the base rdfs:Resource type. To eg. define classes representing
animals and plants, you can do:
</p>
<pre class="programlisting">ex:Eukaryote a rdfs:Class;
rdfs:subclassOf rdfs:Resource;
rdfs:comment "An eukaryote".
</pre>
<p>
By convention all classes use CamelCase names, although class names
are not restricted. The allowed charset is UTF-8.
</p>
<p>
Declaring subclasses is possible:
</p>
<pre class="programlisting">ex:Animal a rdfs:Class;
rdfs:subclassOf ex:Eukaryote;
rdfs:comment "An animal".
ex:Plant a rdfs:Class;
rdfs:subclassOf ex:Eukaryote;
rdfs:comment "A plant".
ex:Mammal a rdfs:Class;
rdfs:subclassOf ex:Animal;
rdfs:comment "A mammal".
</pre>
<p>
With such classes defined, resources may be inserted to the endpoint,
eg. with the SPARQL:
</p>
<pre class="programlisting">INSERT DATA { <merry> a ex:Mammal }
INSERT DATA { <treebeard> a ex:Animal, ex:Plant }
</pre>
<p>
Note that multiple inheritance is possible, resources will just inherit
all properties from all classes and superclasses.
</p>
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