code: String
  rrToString() {
  	StringBuffer sb = new StringBuffer();
  	if (cert != null) {
  		if (Options.check("multiline")) {
  			sb.append("(\n");
  			sb.append(base64.formatString(cert, 64, "\t", true));
  		} else {
  			sb.append(base64.toString(cert));
  		}
  	}
  	return sb.toString();
  }
docs: Converts rdata to a String