During the period of the Ritsuryo system (a system of centralized government based on the ritsuryo code), the interpretation of "Nihonshoki" had been done mainly by ranked officers, professors of the Bureau of Education, and clans in charge of religious ritual services, who handled ceremonies in the Imperial Court.
律令制日本の律令制の時代には主に史官、大学寮の博士や宮中祭儀の担い手であった祭祀系氏族が担い手であった『日本書紀』解釈である。