Re: [dxwg] dcat:keyword- check constraints (#121)

I keep finding the remaining 
```dcat:keyword
  rdf:type owl:DatatypeProperty ;
  rdfs:range rdfs:Literal ;
.```
as very restrictive. I would suggest removing the range considering type it only  `rdf:Property` which will cover all use cases. If that's not acceptable, then `owl:ObjectProperty`. But not as `owl:DatatypeProperty`. 

Using `dcat:theme` in cases of `skos:Concept` is not sufficient. For example, in EU data themes are controlled by [this NAL](https://op.europa.eu/en/web/eu-vocabularies/dataset/-/resource?uri=http://publications.europa.eu/resource/dataset/data-theme). This is a useful classification which does not replace the need for keywords, using in other `skos:Concept`. 

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Received on Thursday, 20 May 2021 05:40:16 UTC