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<a name="defining-cardinality"></a>Defining cardinality of properties</h2></div></div></div>
<p>
By default, properties are multivalued, there are no restrictions in
the number of values a property can store.
</p>
<pre class="programlisting">INSERT DATA { <cat> a ex:Mammal .
<dog> a ex:Mammal .
<peter> a ex:Mammal ;
ex:pets <cat>, <dog> }
</pre>
<p>
Wherever this is not desirable, cardinality can be limited on properties
through nrl:maxCardinality.
</p>
<pre class="programlisting">ex:cromosomes a rdf:Property;
rdfs:domain ex:Eukaryote;
rdfs:range xsd:integer;
nrl:maxCardinality 1.
</pre>
<p>
This will raise an error if the SPARQL updates in the endpoint end up
in the property inserted multiple times.
</p>
<pre class="programlisting"># This will fail
INSERT DATA { <cat> a ex:Mammal;
ex:cromosomes 38;
ex:cromosomes 42 }
# This will succeed
INSERT DATA { <donald> a ex:Mammal;
ex:cromosomes 47 }
</pre>
<div class="note">
Tracker does not implement support for other maximum cardinalities
than 1.
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