public function set($member, $value)
    {
        $member = '_'.$member;
        $members = get_object_vars($this);
        if (array_key_exists($member, $members)) {
            if (is_array($this->$member)) {
                $this->{$member}[] = $value;
            } else {
                $this->$member = $value;
            }

            return TRUE;
        }

        return FALSE;
    }