function get_label($uri, $capitalize = false, $use_qnames = FALSE)
 {
     if ($label = $this->_config->get_first_literal($uri, RDFS_LABEL)) {
         return $label;
     }
     if ($label = $this->_config->get_first_literal($uri, API . 'name')) {
         return $label;
     }
     if ($label = $this->_config->get_first_literal($uri, API . 'label')) {
         return $label;
     } else {
         return parent::get_label($uri, $capitalize, $use_qnames);
     }
 }