Indicates that the value is taken from a set of controlled strings
defined elsewhere. Technically, a code is restricted to a string which
has at least one character and no leading or trailing whitespace, and
where there is no whitespace other than single spaces in the contents
Regex: [^\s]+([\s]?[^\s]+)*
Indicates that the value is taken from a set of controlled strings defined elsewhere. Technically, a code is restricted to a string which has at least one character and no leading or trailing whitespace, and where there is no whitespace other than single spaces in the contents Regex: [^\s]+([\s]?[^\s]+)*