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

Best Practices Document (2024-09-25)

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. Here are the links:

XKOS Best Practices guide (external site)

Markup Examples

• Implementation in French: Codes et nomenclatures de l'Insee. (external site)

License

The XKOS vocabulary is licensed under a Creative Commons Attribution 4.0 License (external site)

Version 1.0 [current version]

Publication date: 2019-05-01 Update: 2022-02-17

• Field Level Documentation (external site)

Initial release of XKOS updated on 2022-02-17. HTML anchors were added in the vocabulary summary table so that terms could be referenced from outside documents (see commit d59ed90).