((null (cdr formats)) ;; - Tag was deliberately hidden,
nil) ;; no format must be returned
(t
;; Tag was found and has formats, we must apply all the
;; formats. TAG may be null so treat that as a special case.
((null (cdr formats)) ;; - Tag was deliberately hidden,
nil) ;; no format must be returned
(t
;; Tag was found and has formats, we must apply all the
;; formats. TAG may be null so treat that as a special case.