URN Handling and Resolution

General Information

CESSDA uses Uniform Reseource Names (URNs), as required by the DDI standards. CESSDA has registered its primary agency and sub-agencies at the DDI Agency Registry.

CESSDA does not provide URN resolution and there is currently no central resolver. However, CESSDA operate multiple sub-agencies for each distinct services

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

CVS

• Content hosted using CVS is canonically exposed with a URN

ELSST

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: https://elsst.cessda.eu/id/{uuid} for the latest, https://elsst.cessda.eu/id/{version}/{uuid}

Versions are written as an ascending number, e.g. 1, 2, 3. We do not have a way to resolve versions at the moment.

The form to use in the SKOS representation matches the URI form, with dc:isVersionOf set to the versionless/latest identifier for each concept. For the root the ID is https://elsst.cessda.eu/id/3/ with dc:isVersionOf set to https://elsst.cessda.eu/id/.