In view of the fact that this book was compiled in "Zushoryo Text Ruiju Myogisho" (compiled in 1103 at the latest), it is considered that the book was written earlier than the above.
『図書寮本類聚名義抄』（康和4年（1103年）までに成立）に載っているので、それ以前に成立したとみられる。