public function insertSuperUser(array $userData){

		if (empty($userData['login']) || empty($userData['password'])){
			throw new tao_install_utils_Exception("To create a super user you must provide at least a login and a password");
		}

		$superUserOntology = dirname(__FILE__) . "/../ontology/superuser.rdf";

		if (!@is_readable($superUserOntology)){
			throw new tao_install_utils_Exception("Unable to load ontology : ${superUserOntology}");
		}

		$doc = new DOMDocument();
		$doc->load($superUserOntology);

		foreach ($userData as $key => $value){
			$tags = $doc->getElementsByTagNameNS('http://www.tao.lu/Ontologies/generis.rdf#', $key);
			foreach ($tags as $tag){
				$tag->appendChild($doc->createCDATASection($value));
			}
		}
		return $this->insertLocalModel($doc->saveXML());
	}