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DOC: Clarified PyTables "natural" names #10518

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Jul 7, 2015
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DOC: Clarified PyTables "natural" names #10518

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7 changes: 4 additions & 3 deletions doc/source/io.rst
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Expand Up @@ -3179,9 +3179,10 @@ Notes & Caveats
.. warning::

``PyTables`` will show a ``NaturalNameWarning`` if a column name
cannot be used as an attribute selector. Generally identifiers that
have spaces, start with numbers, or ``_``, or have ``-`` embedded are not considered
*natural*. These types of identifiers cannot be used in a ``where`` clause
cannot be used as an attribute selector.
*Natural* identifiers contain only letters, numbers, and underscores,
and may not begin with a number.
Other identifiers cannot be used in a ``where`` clause
and are generally a bad idea.

DataTypes
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