Re: [dxwg] Change domain or create superclass of dcat:Distribution (#317)

Here's an example to illustrate the issue. This is one of my own datasets. This DCAT description is adapted from an [earlier example that I used for the bag-of-files use-case](https://w3c.github.io/dxwg/dcat/#ex-dataset-as-bag-of-files).  

The first four blank nodes are `rdf:type dcat:Distribution` because they are informationally-equivalent representations of the actual dataset. 

The next three blank nodes are shown un-typed. They are supporting resources, not representations of the dataset. However, it is useful to provide descriptive properties taken from the set that is associated with `dcat:DIstribution` since these are files or representations, but _not_ of the actual dataset. 

I guess it is fine from an RDF point of view to leave these nodes un-typed, but maybe they deserve a type? The 'model' is the same as dcat:Distribution, but they are _not_ distributions-of-the-dataset. 

```
dap:d33937
  rdf:type dcat:Dataset ;
  dct:description "A set of RDF graphs representing the International [Chrono]stratigraphic Chart, comprising Turtle serializations of data from the 2017-02 version, ..." ;
  dct:identifier "https://doi.org/10.25919/5b4d2b83cbf2d" ;
  dct:issued "2018-07-07"^^xsd:date ;
  dct:license <https://creativecommons.org/licenses/by/4.0/> ;
  dct:publisher <http://www.csiro.au> ;
  dcat:distribution [
      rdf:type dcat:Distribution ;
      dct:identifier "isc2017.jsonld" ;
      dcat:mediaType "application/ld+json" ;
    ] ;
  dct:distribution [
      rdf:type dcat:Distribution ;
      dct:identifier "isc2017.nt" ;
      dcat:mediaType "application/n-triples" ;
    ] ;
  dct:distribution [
      rdf:type dcat:Distribution ;
      dct:identifier "isc2017.rdf" ;
      dcat:mediaType "application/rdf+xml" ;
    ] ;
  dct:distribution [
      rdf:type dcat:Distribution ;
      dct:identifier "isc2017.ttl" ;
      dcat:mediaType "text/turtle" ;
    ] ;
  dct:relation [
      dcat:downloadURL <http://stratigraphy.org/ICSchart/ChronostratChart2017-02.jpg> ;
      dcat:mediaType  "img/jpeg" ;
      dct:description "Coloured image representation of the International Chronostratigraphic Chart" ;
      dct:issued "2017-02-01"^^xsd:date ;
      dct:title "International Chronostratigraphic Chart" ;
    ] ;
  dct:relation [
      dcat:downloadURL <http://stratigraphy.org/ICSchart/ChronostratChart2017-02.pdf> ;
      dcat:mediaType "application/pdf" ;
      dct:description "Coloured image representation of the International Chronostratigraphic Chart" ;
      dct:issued "2017-02-01"^^xsd:date ;
      dct:title "International Chronostratigraphic Chart" ;
    ] ;
  dct:relation [
      dcat:downloadURL <http://resource.geosciml.org/ontology/timescale/gts> ;
      dcat:mediaType "text/turtle" ;
      dct:conformsTo <https://www.w3.org/TR/owl2-overview/> ;
      dct:description "This is an RDF/OWL representation of the GeoSciML Geologic Timescale model, which has been adapted from the model described in Cox, S.J.D, & Richard, S.M. (2005) A formal model for the geologic timescale and GSSP, compatible with geospatial information transfer standards, Geosphere, Geological Society of America 1/3, 119–137." ;
      dct:issued "2011-01-01"^^xsd:date ;
      dct:issued "2017-04-28"^^xsd:date ;
      dct:title "Geologic Timescale model" ;
    ] ;
  dcat:landingPage <https://data.csiro.au/dap/landingpage?pid=csiro:33937> ;
.
``` 

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Received on Monday, 4 February 2019 03:05:52 UTC