/**
* Answer a resource that represents an Individual node in this model.
* If a resource with the given uri exists in the model, it will be re-used.
* If not, a new one is created in the updateable sub-model of the ontology model.
*
* @param string $uri
* @return object Individual
* @access public
*/
function createIndividual($uri = null)
{
$individual = new Individual($uri);
$individual->setAssociatedModel($this);
$individual->setVocabulary($this->vocabulary);
return $individual;
}
