Bibliographical categories in the Chi-Know-Po library are modeled after theSuishu: Jingjizhi隋書經籍志 (Treatise on Classics and Collected Writings of the Book of Sui).Jing經 correspond to the realm of the confucian classics, along with other foundational writings, i.e. classics, apocrypha andxiaoxue小學 (introductory writings). This last category corresponds to lexicons and dictionaries throughout history. It echoes theLiu yi六藝 (Six Classics) in theHanshu: Yiwenzhi藝文志 (Treatise on Classics and Texts of the Book of Han).