NKOS AP Elements

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[updated 2015-10-03]


Networked Knowledge Organization Systems Application Profile (NKOS AP)

  • Title: Networked Knowledge Organization Systems Application Profile (NKOS AP)
  • Short Title: NKOS AP
  • Description: This file specifies the set of RDF classes and properties used in NKOS AP
  • Date Created: 2014-04-03
  • Date Modified: 2015-10-03
  • Creator: Marcia L. Zeng
  • Creator: Maja ┼Żumer
  • Contributor: DCMI NKOS Task Group
  • Version: 0.2
  • Available as: html[2] and RDF/XML [3]


  • When abbreviating terms the suggested prefix is nkos
  • Each class or property in the vocabulary has a URI constructed by appending a term name to the vocabulary URI. For example:http://w3id.org/nkos#alignedWith


  • This file specifies the set of RDF classes and properties used in the "Networked Knowledge Organization Systems Dublin Core Application Profile (NKOS AP)". The metadata schema can be used to describe knowledge organization systems/services (KOS) resources, such as thesauri, classification schemes, subject heading systems, taxonomies, and ontologies that are developed for organizing information and promoting knowledge management.[1] The information about a KOS, including its data model, type, protocol, status, responsible body, available format, affectivity, and other descriptive data are very important to terminology registries, service registries, vocabulary users (machine or human), and retrieval systems. At a minimum level, metadata for KOS resources will describe specific characteristics of a KOS, facilitate the discovery of KOS resources, assist in the evaluation of such resources for a particular application or use, and facilitate sharing, reusing, and collaboration of the KOS resources.
  • This Dublin Core Application Profile for describing KOS resources is developed based on the work the Networked Knowledge Organization Systems (NKOS) group "http://nkos.slis.kent.edu/" [5] members have done since 1998.

[1] For the types of KOS resources, consult NKOS-Types vocabulary [6].

Vocabulary Terms at a Glance


dct:Agent , dct:AgentClass , adms:Asset , frbrer:Expression , dct:LinguisticSystem , frbrer:Manifestation , dct:MediaTypeOrExtent, dct:RightsStatement , frsad:Thema , frbrer:Work


-nkos defined:

nkos:alignedWith , nkos:basedOn , nkos:serviceOffered , nkos:sizeNote , nkos:updateFrequency , nkos:usedBy


dct:audience , dcat:contactPoint , dct:created , dct:creator , wdrs:describedBy , dct:description , dct:format , dct:identifier , frbrer:isEmbodimentOf , dct:isPartOf , frbrer:isRealizationOf , dct:issued , dct:language , dct:modified , dct:publisher , dct:relation , dct:rights , adms:sample , dct:subject , dct: title , dct:type , prov:wasDerivedFrom

Namespaces used by this AP

adms       http://www.w3.org/ns/adms#

dc http://purl.org/dc/elements/1.1/

dcat http://www.w3.org/ns/dcat#

dct http://purl.org/dc/terms/

frbrer http://iflastandards.info/ns/fr/frbr/frbrer/

frsad  http://iflastandards.info/ns/fr/frsad/

nkos http://w3id.org/nkos#

prov http://www.w3.org/ns/prov#

wdrs http://www.w3.org/2007/05/powder-s#

Link to the full document

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