Values of this type denote a (sorted) set of [[zettel identifier|00001006050000]].

A set is different to a list, as no duplicate values are allowed.
=== Allowed values
Must be at least one sequence of 14 digits (""0""–""9""), separated by space characters.
=== Query comparison
A value matches an identifier set value, if the value matches any of the identifier set values.

For example, ""000010060325"" is a prefix ""[[00001006032000]] [[00001006032500]]"".
=== Sorting
Sorting is done by comparing the [[String|00001006033500]] values.