public function unbind($name)
    {

        try {
            // strip off the schema
            $key = $this->stripSchema($name);
            $this->removeAttribute($key);

        } catch (\Exception $e) {
            throw new NamingException(sprintf('Cant\'t unbind %s from naming directory %s', $name, $this->getIdentifier()), null, $e);
        }
    }