public function import(array $data)
    {
        $xml = "<employees>";

        foreach ($data as $user) {
            $xml .= "<employee";
            $xml .= (isset($user['number']) ? " number=\"{$user['number']}\">" : ">");

            foreach ($user as $key => $value) {
                if ($key == "number") {
                    continue;
                }

                if (is_array($value)) {
                    $xml .= "<{$key}>";

                    foreach ($value as $vKey => $vValue) {
                        $xml .= "<{$vKey}>{$vValue}</{$vKey}>";
                    }

                    $xml .= "</{$key}>";
                } else {
                    $xml .= "<{$key}>{$value}</{$key}>";
                }
            }

            $xml .= "</employee>";
        }

        $xml .= "</employees>";

        return $this->post("employees/import", $xml);
    }