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Consortium of European Social Science Data Archives

URN Handling and Resolution

General Information

CESSDA uses URNs, as required by the DDI standards. The URN agency and sub-agencies are registered at the DDI Agency Registry.

CESSDA does not provide URN resolution and there is currently no central resolver.

We have several sub-agencies for the various services

  • - CESSDA owned vocabularies, not the service
  • int.cessda.elsst - ELSST Thesaurus
  • int.cessda.eqb - EQB


  • Content hosted using CVS is canonically exposed with a URN


ELSST’s canonical URLs are resolved to the Skosmos instance using redirects. Every concept has a unique identifier which is mapped using the URI template.

  • URN form: urn:ddi:int.cessda.elsst:{uuid}:{version}
  • URI form:{uuid}

We do not have a way to resolve versions at the moment.

The form to use in the SKOS representation is still under discussion.