language properties don't reference BCP47 or 639-3

[aphillips]

6.3.5 Property: language (etc.)
https://w3c.github.io/dxwg/dcat/#Property:catalog_language

Resources defined by the Library of Congress (1, 2) SHOULD be used.
If a ISO 639-1 (two-letter) code is defined for language, then its corresponding IRI SHOULD be used; if > no ISO 639-1 code is defined, then IRI corresponding to the ISO 639-2 (three-letter) code SHOULD be > used.

The language property of several items in this document have the above reference, which is presumed to related to Dublin Core's definition of language. This doesn't allow for full language tags, which are frequently useful in identifying language. It also doesn't allow for ISO 639-3 codes.

I suspect the problem here, once again, is lack of an IRI reference for BCP47 tags. If that's the case, should someone propose an URN for BCP47? Or do we go to CLDR for help? In any case, this seems a gap that could easily be filled.

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[r12a]

Not sent. Closed in favour of #709