public function AddrAppend($type, $addr) {
    $addr_str = $type . ': ';
    $addresses = array();
    foreach ($addr as $a) {
      $addresses[] = $this->AddrFormat($a);
    }
    $addr_str .= implode(', ', $addresses);
    $addr_str .= $this->LE;

    return $addr_str;
  }