code: String
  rrToString() {
  	StringBuffer sb = new StringBuffer();
  	if (options != null) {
  		sb.append(options);
  		sb.append(" ");
  	}
  	sb.append(" ; payload ");
  	sb.append(getPayloadSize());
  	sb.append(", xrcode ");
  	sb.append(getExtendedRcode());
  	sb.append(", version ");
  	sb.append(getVersion());
  	sb.append(", flags ");
  	sb.append(getFlags());
  	return sb.toString();
  }
docs: Converts rdata to a String