Based on the content of the literature and the depth of processing can be divided into: zero documents, primary documents, secondary documents, tertiary documents.
(1) unprocessed published manuscripts, data original records and other documents belong to the zero document, which is the basis of the primary literature.
(2) Monographs, newspapers, periodicals, patent documents, standard documents, conference documents, samples and other finished documents belong to primary documents;
(3) Reprocessing of primary documents, by organizing, refining and compressing them, and sequencing them according to their external characteristics (title, author, physical characteristics of the document) and content characteristics, to form another type of new forms of documents -- catalogs, bibliographies, indexes, abstracts, which is the secondary literature;
(4) the use of secondary literature, select the relevant primary literature and then analyze, synthesize and prepare the third level of the form of literature -- thematic reports, reviews, progress and tools such as manuals, encyclopedias, yearbooks, etc., which is the tertiary literature.
Extended information:
The traditional hierarchical enumeration classification is gradually developing towards a faceted grouping classification. Including: continue to improve the faceted grouping type classification method, so that it achieves the purpose of practical application; transform the traditional rank enumeration type classification method, so that it gradually to the faceted grouping direction; the rank enumeration type classification method and the faceted grouping type classification method used in combination.
The classification method and the theme method gradually tend to be integrated. Classification and subject method in the concept (terminology) system, reference system, citation system, indexing system, retrieval system, etc. increasingly compatible. Literature classification method gradually tends to standardization and internationalization. ⑤ The compilation and management of literature classification list, as well as citation and retrieval, gradually tend to be automated.
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