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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="defining-properties"></a>Defining properties</h2></div></div></div>
<p>
	Properties relate to a class, so all resources pertaining to that class
	can define values for these.
      </p>
<pre class="programlisting">ex:cromosomes a rdf:Property;
              rdfs:domain ex:Eukaryote;
              rdfs:range xsd:integer.

ex:unicellular a rdf:Property;
               rdfs:domain ex:Eukaryote;
               rdfs:range xsd:bool;

ex:dateOfBirth a rdf:Property;
               rdfs:domain ex:Mammal;
               rdfs:range xsd:dateTime;
</pre>
<p>
	The class the property belongs to is defined by rdfs:domain, while the
	data type contained is defined by rdfs:range. By convention all
	properties use lowerCamelCase names, although property names are not
	restricted. The allowed charset is UTF-8.
      </p>
<p>
	The following basic types are supported:
      </p>
<p><b><code class="systemitem">xsd:boolean</code></b></p>
<p><b><code class="systemitem">xsd:string</code></b></p>
<p><b><code class="systemitem">xsd:integer</code></b>Ranging from -2^63 to 2^63-1.</p>
<p><b><code class="systemitem">xsd:double</code></b>Able to store a 8 byte IEEE floating point number.</p>
<p><b><code class="systemitem">xsd:date and xsd:dateTime</code></b>
	  Able to store dates and times since January 1, 1970 UTC, with
	  millisecond resolution.
	</p>
<p>
	Of course, properties can also point to resources of the same or
	other classes, so stored resources can conform a graph:
      </p>
<pre class="programlisting">ex:parent a rdf:Property;
          rdfs:domain ex:Mammal;
          rdfs:range ex:Mammal;

ex:pet a rdf:Property;
       rdfs:domain ex:Mammal;
       rdfs:range ex:Eukaryote;
</pre>
<p>
	There is also inheritance of properties, an example would be a property
	in a subclass concretizing a more generic property from a superclass.
      </p>
<pre class="programlisting">ex:geneticInformation a rdf:Property;
                      rdfs:domain ex:Eukaryote;
                      rdfs:range xsd:string;

ex:dna a rdf:Property;
       rdfs:domain ex:Mammal;
       rdfs:range xsd:string;
       rdfs:subPropertyOf ex:geneticInformation.
</pre>
<p>
	SPARQL queries are expected to provide the same result when queried
	for a property or one of its superproperties.
      </p>
<pre class="programlisting"># These two queries should provide the exact same result(s)
SELECT { ?animal a ex:Animal;
                 ex:geneticInformation "AGCT" }
SELECT { ?animal a ex:Animal;
                 ex:dna "AGCT" }
</pre>
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