Wanfang database belongs to several times literature

belongs to the secondary literature database.

Common types of literature are:

Categorized by the depth of processing of the literature: zero times the literature, primary literature, secondary literature, tertiary literature.

Categorized by the form of the carrier of the literature: printed, microform, machine-readable, digitized (CD-ROM and online network).

Categorized by the form of publication of the literature: books (monographs, tools, textbooks, history books, antiquities, etc.), serial publications (periodicals, newspapers, journals), special literature (patent literature, conference literature, standard literature, scientific and technical reports, government publications, product samples, etc.).

Components of literature:

Literature consists of three elements, knowledge, carrier, record mode of the trinity is inseparable. In accordance with the definition of the literature, the literature of this particular carrier must simultaneously meet such three basic conditions: one is a certain information, knowledge content, the second to utilize a certain means of recording, the third is to show a certain carrier form.

Information and knowledge is the main body of the literature, there is no information, knowledge content of any form of carrier, can only be called material, but can not be called literature. Any form, type of literature must first have a certain information, knowledge content as a prerequisite.

Literature classification method (referred to as classification) is organized by a number of categories according to certain principles of the classification system, and marking symbols to represent the various levels of categories and fix the order. It is the intelligence library department daily used to classify the literature, the organization of the collection of tools. Literature classification is the manifestation of the classification table, so it is customary to often equate the classification and classification table to a concept.