Simple Knowledge Organization System
W3C standard for thesauri, classification schemes, taxonomies, and controlled vocabularies.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Publish taxonomies as linked data
Migrate library thesauri to the web
Vocabulary management and alignment
Build faceted classification systems
W3C-Document-LicenseDerivative works may be distributed only as software, supporting materials or documentation — not as a standalone or competing technical specification.
Derived from SKOS, Copyright (c) 2009 World Wide Web Consortium. https://www.w3.org/Consortium/Legal/copyright-documents. Source: https://www.w3.org/TR/skos-reference/
Verified against the licence text on 2026-08-07.
Others worth a look in Web Standards.