public function setSubClassOf( core_kernel_classes_Class $resource,  core_kernel_classes_Class $iClass)
    {
        $returnValue = (bool) false;

		$subClassOf = new core_kernel_classes_Property(OntologyRdfs::RDFS_SUBCLASSOF);
		$returnValue = $this->setPropertyValue($resource, $subClassOf, $iClass->getUri());

        return (bool) $returnValue;
    }