:class:`DataFrame` to ``None`` when said string is encountered with a
        normal :class:`Index`. For a :class:`MultiIndex`, the same limitation
        applies to any strings beginning with 'level_'. Therefore, an
        :class:`Index` name of 'index'  and :class:`MultiIndex` names starting
        with 'level_' are not supported.

    See Also
    --------
    build_table_schema : Inverse function.
    pandas.read_json
    )