By the Han dynasty, the first attempt to categorise Chinese classics was done by Liu Xiang (劉向; 77 BCE – 6 CE) and his son Liu Xin (劉歆; 46 BCE – 23 CE) into 6 distinct categories with a general catalogue making it a 7-part system. (Chinese:七略; pinyin:Qīlüè).
This classification system included the following categories,
Summary of Prescriptions & Techniques (Chinese:方技略; pinyin:Fāngjìlüè) - Medicine, pharmacology, and healing techniques.
During the Jin dynasty, Xun Xu (荀勗; 221 – 289) complied Zhongjing Xinbu (中經新簿) based on a previous work, which originally had six categories but was now condensed into four.
Jia (甲部) - classics
Yi (乙部) - philosophical writings
Bing (丙部) - historical works
Ding (丁部) - poetry and rhapsodies
These categories were reminiscent of the current categories of the Sibu classification. These categories were later redefined by Li Chong (李充) by moving historical works into Yi (乙部) and philosophical writings into Bing (丙部).
The Sibu classification was formally established by the Tang dynasty, occurring in the work, Suishu·Jingjizhi (隋書經籍志). The work adopted names for the four categories, 經, 史, 子, and 集. This system was in used up to the Qing dynasty and influenced classification methods in Korea, Japan, and Vietnam.
History (Chinese:史; pinyin:shǐ) - Historical records, dynastic histories, and biographies. Includes books such as Shiji.
Philosophy (Chinese:子; pinyin:zǐ) - Works from various schools of thought, such as Taoism, Legalism, Buddhism, as well as scientific, medical, and technical texts.
↑Shang, Wenyi; Jett, Jacob; Underwood, Ted; Downie, John Stephen (31 Dec 2022). "Descriptive Cataloging Issues for Non-Western Corpora: A Case Study of Late Imperial Chinese Books". Cataloging & Classification Quarterly. 61 (1). doi:10.1080/01639374.2022.2148800.