He Xiu's annotation of the Eastern Han Dynasty ("Spring and Autumn Gongyang's Exegesis"), Xu Yanshu of the Tang Dynasty. Twenty-eight volumes. He Xiu studied the modern classics and formulated definitions and examples for the Chunqiu Gongyang Zhuan, turning it into an organized modern classics work. Xu Yanzuoshu also preserved some old sayings before the Tang Dynasty. It is a representative work of the Jinwen Jing school. Included in "Commentaries on the Thirteen Classics".