@Override
    public List<Byte> serializeToByteList() throws IOException {
        java.util.List<Byte> byteList = new ArrayList<>();
        byteList.addAll(this.extendGUID1.serializeToByteList());
        byteList.addAll(this.extendGUID2.serializeToByteList());
        return byteList;
    }
This method is used to convert the element of CellID basic object into a byte List.

@return Return the byte list which store the byte information of CellID.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/onenote/fsshttpb/streamobj/basic/CellID.java