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XKOS (Extended Knowledge Organization System)

XKOS extends Simple Knowledge Organization System (SKOS) for the needs of statistical classifications. It does so in two main directions. First, it defines a number of terms that enable the representation of statistical classifications with their structure and textual properties, as well as the relations between classifications. Second, it refines SKOS semantic properties to allow the use of more specific relations between concepts. Those specific relations can be used for the representation of classifications or for any other case where SKOS is employed. XKOS adds the extensions that are desirable to meet the requirements of the statistical community.

 Supports Activities

  • Publication of statistical classifications for within- or between-agency reuse
  • Management of statistical classification terms, lists, families, and collections over time
 

Download current version

 

Learn more about specific versions:

V.1.0 (2019) (Current)

 
Best Practices
  • This XKOS Best Practices guide (a ReSpec document) provides examples of how to use the XKOS vocabulary. The expected uses of RDF properties are specified using SHACL constraints. You can see examples of the implementation of our nomenclatures in XKOS via INSEE's SPARQL EndPoint.
Examples

 

 

Resources
  • Dan Gillman, Franck Cotton, and Yves Jaques. eXtended Knowledge Organization System (XKOS), presentation. METIS, Work Session on Statistical Metadata, Geneva, Switzerland, May 2013. [PDF]
  • Frank Cotton, Richard Cyganiak, R.T.A.M. Grim, Daniel W. Gillman, Yves Jaques, and Wendy Thomas. XKOS: An SKOS Extension for Statistical Classifications. The Hague, The Netherlands: Proceedings of the 59th World Statistics Congress of the International Statistical Institute, 2013. [PDF]
  • Frank Cotton, Richard Cyganiak, R.T.A.M. Grim, Daniel W. Gillman, Yves Jaques, and Wendy Thomas. XKOS: An SKOS Extension for Statistical Classifications -- Poster [PDF}
  • Tools used to create, display, and access DDI instances (filtered by product) 
  • Training Materials
  • DDI Glossary
License

The XKOS vocabulary is licensed under a Creative Commons Attribution 4.0 License

Development Work