On the Important Content Characters about Annotation of Xiaojing by Tang Xuan_zong

The annotation of Xiaojing by Tang Xuan_zong is the most popular annotation about Xiaojing after Tang Dynasty. Contract with Zheng's Annotation and Kong's Annotation which were the most popular annotation before Tang Dynasty, Tang xuan_zong' s Annotation appears some obvious characters.Firstly,Tang Xuan_zong's Annotation is very brief to the point and easy to understand in write style. Secondly, Xuan_zong learned widely strong points from all other annotations and brought them into his own annotation. Thirdly, it stresses connection with reality and carries on the idea of rule country by filial piety .These characters are the most important reasons that Xuan_zongs' Annotation can replace all other annotations of Xiaojing and become the important popular annotation after Tang Dynasty.