appears_in: []
contributor:
  email: cthoyt@gmail.com
  github: cthoyt
  name: Charles Tapley Hoyt
  orcid: 0000-0003-4423-4370
depends_on: []
deprecated: false
description: The Dewey Decimal Classification (DDC) system, devised by library pioneer
  Melvil Dewey in the 1870s and owned by OCLC since 1988, provides a dynamic structure
  for the organization of library collections. Now in its 23rd edition, and available
  in print and Web versions, the DDC is the world's most widely used library classification
  system.
example: '325.4'
example_extras:
- '3'
- '32'
- '325'
- 325.4-325.9
homepage: http://www.oclc.org/dewey/
keywords: []
license: http://rightsstatements.org/vocab/InC/1.0
mappings:
  bartoc: '241'
  wikidata.entity: Q48460
name: Dewey Decimal Classification
namespace_in_lui: false
pattern: ^(([0-9][0-9]?|[0-9]{3}(-[0-9]{3})?|[0-9]{3}(-[0-9]{3}(:[0-9]+)?)?|[0-9]{3}\.[0-9]+(-[0-9]{3}\.[0-9]+(:[0-9]+)?)?|T[1-9][A-Z]?--[0-9]+(-T[1-9][A-Z]?--[0-9]+(:[0-9]+)?)?|[1-9][A-Z]?--[0-9]+(-[1-9][A-Z]?--[0-9]+(:[0-9]+)?)?)?)$
preferred_prefix: ddc
prefix: ddc
providers: []
publications: []
synonyms: []
uri_format: http://dewey.info/class/$1/e23/
