1, primary literature refers to the original literature created on the basis of the author's own research results, such as journal papers, research reports, patent specifications, conference papers, etc.
2. Secondary literature is a retrieval tool, such as bibliography, title, introduction, abstract, etc. , which is generated after processing and sorting the original vouchers.
3. The three documents are based on the first-level documents and the second-level documents. People usually refer to these documents as the results of "information research", such as reviews, thematic reviews, annual summaries of disciplines, progress reports, data manuals and so on.
Extended data:
The evolution of literature:
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The literature we are talking about today mainly refers to the relatively important written materials with historical significance, and the broad definition of literature has become all the carriers of recording knowledge. According to the international definition, literature is the carrier of all information.
With the development of society, the concept of "literature" has changed a lot. In addition to ancient books, people also call monuments, antiquities, models, inscriptions and paintings "historical documents". 1984 the definition of "document" in People's Republic of China (PRC)'s national standard "General Rules for Document Description" is: "document: records all carriers with knowledge.
In this definition, there are two key words: "knowledge" is the core content of literature, and "carrier" is the material shell on which knowledge depends, that is, some artificial solid attachments to record knowledge. That is to say, except books, periodicals and other publications, all Oracle Bone Inscriptions, epigraphy, bamboo slips, rubbings, maps, microfilms, videos, audio-visual materials, etc. Words containing words belong to the category of literature.
For thousands of years, our ancestors have created rich and splendid cultural achievements, which are mainly recorded in the voluminous ancient books and classics. These are classical documents. Among them, the books and materials directly related to a certain subject are the literature of that subject.
The basic task of classical philology is to inherit the methods, experiences and achievements of ancient collators, use the viewpoints and methods of historical materialism and dialectical materialism to explore, collect, sort out and study these documents, discard the false and retain the true, research the origin of mirrors, make them known, mastered and utilized by professional workers at all levels in various disciplines, and create new scientific culture on this basis, thus making contributions to all mankind.