public function email()
    {
        $this->raw();

        $email = null;
        $person = $this->person();

        if (isset($person->emails)) {
            if (isset($person->emails->email)) {
                if (is_array($person->emails->email) && isset($person->emails->email[0])) {
                    $email = $person->emails->email[0]->value;
                }
            }
        }

        return $email;
    }