private function loadFromExtensions(array $content)
    {
        foreach ($content as $namespace => $values) {
            if (in_array($namespace, array('imports', 'parameters', 'services'))) {
                continue;
            }

            if (!is_array($values) && null !== $values) {
                $values = array();
            }

            $this->container->loadFromExtension($namespace, $values);
        }
    }