public static function getAvailableLangsByUsage( core_kernel_classes_Resource $usage)
    {
        $returnValue = array();
        
        foreach (self::getAvailableLangs() as $code => $langData) {
            if (in_array($usage->getUri(), $langData[tao_models_classes_LanguageService::PROPERTY_LANGUAGE_USAGES])) {
                $lang = new core_kernel_classes_Resource($langData['uri']);
                $returnValue[$code] = $lang->getLabel();
            }
        }
        return $returnValue;
    }