@property
def xlsx():
    """An Excel '07+ Spreadsheet representation of the :class:`Dataset` object, with :ref:`separators`. Cannot be set.

         .. admonition:: Binary Warning

             :class:`Dataset.xlsx` contains binary data, so make sure to write in binary mode::

                with open('output.xlsx', 'wb') as f:
                    f.write(data.xlsx)'
        """
    pass
