Maintenance of Vocabulary Encoding Schemes

[niklasl]

See: https://www.dublincore.org/specifications/dublin-core/dcmi-terms/#section-4

• The external "see" reference for NLM is broken.
• The external "see" reference for UDC gives a HTTP (insecure) warning.

Questions:

• Should we note that these individual instances of dcam:VocabularyEncodingScheme are historical/"archaic" and that users may want to replace these IRIs with some respective formal IRIs (e.g. when there are skos:ConceptScheme equivalencies of them)?
• Do we want to split them (the entire section) out from the main dcmi-terms document?
• Should we note that dcam:VocabularyEncodingScheme is also "archaic" and suggest to use skos:ConceptScheme instead?