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Chinese Library Classification (the fifth edition), edited by Editorial Committee of the NLC Chinese Library Classification, was published by the National Library of China Press officially in August 2010, which, as an important event in library and information community, was of great significance for literature, information and knowledge organization and retrieval in China's libraries and information institutions.
Based on scientific classification and knowledge classification, Chinese Library Classification (hereafter referred to as CLC), a category list index edited by combining literature contents characteristics and form features, was a tool for literature classification, shelving, and retrieval. It was not only used in libraries and information institutions, but also used in many kinds of databases or even Internet. Up to present, it has become the most effective and extensive classification in China.
Since the publication of CLC, the NLC and the Editorial Committee of Chinese Library Classification had always been maintaining CLC in manner of update and edition revision. The CLC compilation was started in 1971. Four editions had been published in 1975, 1980, 1990 and 1999 successively. After the publication of the fourth edition, CLC had been updated and maintained through different websites, such as Journal of the National Library of China, the CLC website (http://clc.nlc.gov.cn), the electronic version of CLC, Chinese Classified Thesaurus (the second edition), Chinese Classified Thesaurus (web version) (http://cct.nlc.gov.cn), reflecting the users' advices and suggestions, and solving the practical problems in classification.
The Editorial Committee of the NLC Chinese Library Classification began to revise the fourth edition of CLC in September 2005. Through the participation and efforts of different institutions in the past 5 years, the fifth edition of CLC has just been published officially by the National Library of China Press. The revised CLC, with distinguished characteristics of the times, satisfied the index and retrieval demands of literature and information resources much better, achieving the intended effect.
There were 34 members and consultants from 26 institutions shouldering the revision task, and about 100 experts from 58 institutions taking part in the revision work, so the fifth edition of CLC was the achievement and crystallization of the colleagues in nationwide. The web version, electronic version, abridged version and journal version of the fifth edition of CLC would be published in succession, so as to satisfy different users' demands.
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