Class SubtypeIsSubsetQualifierHierarchy

@AnnotatedFor("nullness") public class SubtypeIsSubsetQualifierHierarchy extends MostlyNoElementQualifierHierarchy
A QualifierHierarchy where, when a qualifier has arguments, the subtype relation is determined by a subset test on the elements (arguments). The elements must be strings.

This assumes that if the lub or glb of two qualifiers has elements, then both of the arguments had the same kind as the result does.