According to explanatory notes in a book of comparison, the criteria for selecting the manuscripts for comparison and collation are generally as follows: the Aobyoshi-bon line manuscripts which were made by the period of the Northern and Southern Courts (Japan); the Kawachi-bon line manuscripts which were made during the Kamakura period; the Beppon manuscripts which were made during the Muromachi period.
なお、校異編の凡例によれば、比較校合に採用した写本の基準は、おおむね、青表紙本系統の写本については南北朝時代(日本)ころまでの書写であるもの。河内本系統の写本については鎌倉時代ころまでの書写であるもの。別本の写本については室町時代ころまでの書写であるもの。としている。