code: public static void write(XMLOutputter xml, MD5MD5CRC32FileChecksum that
        ) throws IOException {
      xml.startTag(MD5MD5CRC32FileChecksum.class.getName());
      if (that != null) {
        xml.attribute("bytesPerCRC", "" + that.bytesPerCRC);
        xml.attribute("crcPerBlock", "" + that.crcPerBlock);
        xml.attribute("md5", "" + that.md5);
      }
      xml.endTag();
    }
docs: Write that object to xml output.