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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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