WordSet Key Type
Values of this type denote a (sorted) set of words.
A set is different to a list, as no duplicate values are allowed.
Allowed values
Must be a sequence of at least one word, separated by space characters.
Query operator
All comparisons are done case-insensitive, i.e. hell
will be the prefix of World, Hello
.
Sorting
Sorting is done by comparing the String values.