Literature classification and definition

Literature can be divided into first-class literature, second-class literature and third-class literature according to its content, nature and processing mode. This paper will define and explain these three documents in detail.

Original documents

Primary literature refers to the original literature created on the basis of the author's own research results, such as periodical papers, research reports, patent specifications, conference papers, etc.

The second article

Secondary literature is one of the retrieval tools such as bibliography, title record, introduction and abstract.

Three documents

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.

Zero-order literature

Zero-level documents refer to original documents without any processing, such as experimental records, manuscripts, original audio recordings, original video recordings, conversation record, etc. Zero-level documents play an important role in the preservation of original documents, the verification of original data and the verification of original ideas (owners).