In contrast, Joganshiki (Palace regulations of the Jogan era) stated in the preface (presently contained in "Ruiju kokushi" - Classified National History) that the prescription of rules and customs was provided separately from shiki (Regulations) -- 'Jogan Gishiki' (or, simply "Gishiki") was considered to be that prescription.
反対に貞観式では序文（現在は『類聚国史』所収）に式とは別に儀式次第を作成することが明記されており、「貞観儀式」（もしくは単に「“儀式”」）がそれにあたると考えられている。