Nominal Attributes in LibSVM

When creating a libsvm workout file, how do you distinguish a nominal attribute from a verse of a numeric attribute? I am trying to encode certain nominal attributes as integers, but I want libsvm not to distort them as numeric values. Unfortunately, the libsvm website has very little documentation. Pentaho docs seems to imply that libsvm makes this distinction, but I still don't understand how this is done.

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Do not do this I'm trying to encode certain nominal attributes as integers .

Rather, use a separate binary function for each value of each nominal attribute.

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