((p "Values of this type denote a (sorted) set of " (a (@ (href . "00001006050000")) "zettel identifier") ".") (p "A set is different to a list, as no duplicate values are allowed.") (h2 (@ (id . "allowed-values")) "Allowed values") (p "Must be at least one sequence of 14 digits (" (@L (@H "“") "0" (@H "”")) "–" (@L (@H "“") "9" (@H "”")) "), separated by space characters.") (h2 (@ (id . "query-comparison")) "Query comparison") (p "A value matches an identifier set value, if the value matches any of the identifier set values.") (p "For example, " (@L (@H "“") "000010060325" (@H "”")) " is a prefix " (@L (@H "“") (a (@ (href . "00001006032000")) "00001006032000") " " (a (@ (href . "00001006032500")) "00001006032500") (@H "”")) ".") (h2 (@ (id . "sorting")) "Sorting") (p "Sorting is done by comparing the " (a (@ (href . "00001006033500")) "String") " values."))