Section 9 includes a table with several controlled vocabularies that MUST be used for the listed properties, but most of them are not dereferencable (some don't have public URIs and others always return 404). This issue has also be raised in relation to EUROVOC https://joinup.ec.europa.eu/asset/dcat_application_profile/issue/eurovo…, but IMO should be extended to every required vocabulary.
We may need to stablish some minimal requirements for a controlled vocabulary to be propossed as a MUST use, e.g.:
- Openly licensed.
- Operated/maintained by official EU bodies or institutions or otherwise by any recognised standardisation body, etc (see also https://joinup.ec.europa.eu/asset/dcat_application_profile/issue/regist…).
- ... others?
Once we have the minimal requirements we may need to revisit this list and take the proper actions to replace, downgrade (not required) or try to improve several of the vocabularies.