The decimal number classification introduced the concepts of relative location and relative index. Libraries previously had given books permanent shelf locations that were related to the order of acquisition rather than topic. The classification's notation makes use of three-digit numbers for main classes, with fractional decimals allowing expansion for further detail. Numbers are flexible to the degree that they can be expanded in linear fashion to cover special aspects of general subjects.[2] A library assigns a classification number that unambiguously locates a particular volume in a position relative to other books in the library, on the basis of its subject. The number makes it possible to find any book and to return it to its proper place on the library shelves.[Note 2] The classification system is used in 200,000 libraries in at least 135 countries.[3][4]
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The OCLC has maintained the classification since 1988, and also publishes new editions of the system. The editorial staff responsible for updates is based partly at the Library of Congress and partly at OCLC. Their work is reviewed by the Decimal Classification Editorial Policy Committee, a ten-member international board which meets twice each year. The four-volume unabridged edition was published approximately every six years, with the last edition (DDC 23) published in mid-2011.[36] In 2017 the editorial staff announced that the English edition of DDC will no longer be printed, in favor of using the frequently updated WebDewey.[37] An experimental version of Dewey in RDF was previously available at dewey.info beginning in 2009,[38] but has not been available since 2015.[39]
The Dewey Decimal Classification organizes library materials by discipline or field of study. The scheme comprises ten classes, each divided into ten divisions, each having ten sections. The system's notation uses Indo-Arabic numbers, with three whole numbers making up the main classes and sub-classes and decimals designating further divisions. The classification structure is hierarchical and the notation follows the same hierarchy. Libraries not needing the full level of detail of the classification can trim right-most decimal digits from the class number to obtain more general classifications.[41] For example:
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The Library of Congress Classification (LCC) is the system of classification used in most research and university libraries in the United States. LCC was created in 1891 specifically to meet the needs of the Library of Congress collection. It is based on twenty-one classes designated by a single letter. These are divided into subclasses that add one or two letters to the initial class. Topics within the subclasses are assigned whole numbers which can be expanded into decimals to identify more specific areas of the topic. This is followed by an alphanumeric author identifier which may be followed by publishing date and other details to produce a unique call number for the item. As with DDC, depending on the level of specificity needed, the call numbers can get fairly long. Example: PR9199.3.M3855 L54 2007 c.2
Effective July 1, 2013, the Library of Congress discontinued print publication of its classification system. (Press release announcing the change.) Due to reduced demand, LC decided to transition to web-only publication of its cataloging documentation. Going forward, LCC subject headings, classification schedules and other cataloging publications will be released as downloadable pdf files free of charge from the Acquisitions and Bibliographic Access Directorate website.
WorldCat also allows the Linked Data record to be downloaded in Turtle, JSON-LD, RDF/XML, N-TRIPLES, or HTML+RDFa. It is possible to observe the presence of a dewey.info URI, which creates a link between the WorldCat record and the DDC notation, confirming that the catalog adheres to Dewey Linked Data. 2ff7e9595c
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