[odrl-vocab][odrl-model] Does the JSON-LD serialization distinguish human-readable and machine-readable strings for DC terms?

Hello POE WG,

[This is a personal comment, not related to the i18n review of my other 
e-mail.]

The JSON-LD encoding allows Dublin Core annotations. There is an example 
of such an annotation in the section "Policy metadata"[1] in the "ODRL 
Information Model". However, the Dublin Core terms "creator", "coverage" 
and "description" can, in general, contain either human-readable text or 
machine-readable text (such as a URL) and ODRL does not explain how the 
two are distinguished in the JSON-LD encoding.

The example, in fact, shows two URLs, but doesn't use the JSON-LD key 
"@id" to type them as URLs. Shouldn't it be something like

    ...
    "dc:coverage": {
      "@id": "https://www.iso.org/obp/ui/#iso:code:3166:AU-QLD"
    }
    ...


Also (but maybe this is just a typo), Dublin Core recommends the W3CDTF 
profile of ISO 8601 for dates, so maybe the example would be better with 
a "T" instead of a ":" in the middle:

    "dc:issued": "2017-01-01T12:00"

instead of

    "dc:issued": "2017-01-01:12:00"



[1] https://w3c.github.io/poe/model/#provenace



Bert
-- 
  Bert Bos                                ( W 3 C ) http://www.w3.org/
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