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Explicitly-defined attributes
The name of each explicitly-defined attribute is followed by a colon `:' and a description of the
values taken by the attribute. There are six possibilities:
continuous
date
time
timestamp
The attribute takes numeric values.
The attribute's values are dates in the form YYYY/MM/DD or YYYY-MM-DD, e.g.
1999/09/30 or 1999-09-30.
The attribute's values are times in the form HH:MM:SS with values between 00:00:00 and
23:59:59.
The attribute's values are times in the form YYYY/MM/DD HH:MM:SS or YYYY-MM-
DD HH:MM:SS, e.g. 1999-09-30 15:04:00. (Note that there is a space separating the
date and time.) a comma-separated list of names
The attribute takes discrete values, and these are the allowable values. The values may be
prefaced by [ordered] to indicate that they are given in a meaningful ordering, otherwise
they will be taken as unordered. For instance, the values low, medium, high are ordered,
while meat, poultry, fish, vegetables are not. The former might be declared as
grade: [ordered] low, medium, high.
If the attribute values have a natural order, it is better to declare them as such so that See5
can exploit the ordering. (NB: The target attribute should not be declared as ordered.)
discrete N for some integer N
The attribute has discrete, unordered values, but the values are assembled from the data
itself; N is the maximum number of such values. (This is not recommended, since the data
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