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lines changed Original file line number Diff line number Diff line change @@ -124,3 +124,22 @@ for each data type:
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{+adl+} supports the `Package Syntax
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<https://golang.org/pkg/regexp/syntax/>`__ for regular expressions
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in the path to the filename.
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+
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+ Parsing Null Values from Filenames
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+ ----------------------------------
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+
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+ If there is an empty string (``""``) in the place of an attribute in the path
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+ to the file, {+dl+} automatically parses it as a null value for all the
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+ attribute types except ``string``. For example, consider the following |s3|
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+ {+data-lake-store+}:
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+
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+ .. code-block:: none
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+ :emphasize-lines: 3
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+
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+ /records/january/1.json
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+ /records/february/1.json
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+ /records//1.json
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+
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+ For the path ``/records/{month string}/*``, {+dl+} does not add any
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+ computed fields for the ``month`` attribute to documents generated
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+ from the third record in the above store.
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