A qualitative value is a predefined value for a product characteristic. Examples: the color "green" or the power cord plug type "US"; the garment sizes "S", "M", "L", and "XL". Note: Value sets are supported by creating subclasses of this class. Ordinal relations between values (gr:greater, gr:lesser, ...) are provided directly by GoodRelations. Compatibility with schema.org: This class is equivalent to http://schema.org/Enumeration.