Blurb::
Whether the set-valued variables are categorical or relaxable

Description::

A list of strings of length equal to the number of set (integer,
string, or real) variables indicating whether they are strictly
categorical, meaning may only take on values from the provided set, or
relaxable, meaning may take on any integer or real value between the
lowest and highest specified element. Valid categorical strings
include 'yes', 'no', 'true', and 'false', or any abbreviation in
[yYnNtTfF][.]*

Topics::        

Examples::
Discrete_design_set variable, 'rotor_blades', can take on only integer
values, 2, 4, or 7 by default. Since categorical is specified to be
false, the integrality can be relaxed and 'rotor_blades' can take on
any value between 2 and 7, e.g., 3, 6, or 5.5.

\verbatim
discrete_design_set
	integer 1
        elements 2 4 7
	descriptor 'rotor_blades'
	categorical 'no'
\endverbatim

Theory::
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