NIST KAT files are composed of properties, such as:

 [SHA-1] [PredictionResistance = True] [EntropyInputSize = 128] 

and individual known answer tests using these properties, ex:

 COUNT = 0 EntropyInput = 7 PersonalizationString = Result = 8 COUNT = 1 EntropyInput = 4 PersonalizationString = Result = 2 

Using 'many parseCategory' this input would be converted to a single element list of TestCategory:

 [([("SHA-1",""), ("PredictionResistance", "True"), ("EntropyInputSize", "128")], [ [("COUNT", "0"), ("EntropyInput", "7"), ("PersonalizationString", ""), ("Result", "8")], , [("COUNT", "1"), ("EntropyInput", "4"), ("PersonalizationString", ""), ("Result", "2")]])] 

that is, a list of tuples, the first element is a list of properties (key/value pairs) and the second element is a list of tests. Each test is itself a list of records (key/value pairs). Properties apply to all tests contained in the second element of the tuple.