"Kokyo" had once disappeared as a result of the "Burning of books and burying of scholars" in Ancient China; however, two editions were rediscovered during the Former Han period, and were called 'Kobun' and 'Kinbun,' respectively, due to their font style.
『孝経』は、焚書坑儒の煽りを受けて一時所在が不明となり、前漢に入って2種類の系統の本が再発見され、その字体から「古文」・「今文」と呼ばれた。