public function setUseFramework(string $use_framework = "F") : CNabuDataObject
    {
        if ($use_framework === null) {
            throw new ENabuCoreException(
                    ENabuCoreException::ERROR_NULL_VALUE_NOT_ALLOWED_IN,
                    array("\$use_framework")
            );
        }
        $this->setValue('nb_site_use_framework', $use_framework);
        
        return $this;
    }