set unordered set Damion Dooley An unordered set is a set of elements which have no intrinsic (semantic) order with respect to each other. The set of all living people is not intrinsically ordered; an ordering can only be provided by looking at some partiular feature of the given set elements. The set can have a very large or infinite (open-ended) number of values. Because the elements are essentially open-ended, we can only offer a lookup-as-you-type function for selecting past-used items. Use "Categorical" for unordered sets where items are finite, pre-defined and not too numerous. Strings are only indirectly ordered insofar as strings can be sorted by character - but this requires picking apar the name strings, an examination which has no inherent semantic relation to the things being named. That one email address or name comes before another is arbitrary. Only numbers are directly ordered. requires discussion