The development of literary concepts has gone through three stages:
It was first seen in the Eight Letters of The Analects of Confucius, which was interpreted by Zhu in the Song Dynasty as: the text refers to ancient books, and the sages are familiar with historical facts.
Modern times are generally understood as articles and books with historical value or important books and materials related to a certain subject.
Modern scholars believe that literature is the carrier to record human knowledge and information. It consists of four elements: document content, carrier material, information symbol and recording method.
Law of file distribution:
Patents, standards and archives are managed by a country's specialized departments, which are the State Patent Office, the State Bureau of Technical Supervision, the State Archives Bureau and corresponding institutions in various places.
Academic papers are collected by the National Library, China Institute of Science and Technology Information and degree-granting units.
Books, periodicals, meeting records and reports are mainly provided by the national literature information system.
The national document information system includes four systems: science and technology information system, library system of Academy of Social Sciences, university library system and public library system.
Reference to the above content: Baidu Encyclopedia-Literature Retrieval