
Machine-readable data is data (or metadata) which is in a format that can be understood by a computer. There are two types; human-readable data that is marked up so that it can also be read by machines (examples; microformats, RDFa) or data file formats intended principally for machines (RDF, XML, JSON). For purposes of implementation of the GPRA ...
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http://en.wikipedia.org/wiki/Machine-readable_data

Imprinted alphanumeric data, including name and address that can be read and converted to magnetic form by an optical character reader.
Found on
http://www.nmoa.org/Library/index.htm
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