dcat:mediaType - check constraints #127

In DCAT v1 the property dcat:mediaType is axiomatized

dcat:mediaType
  rdf:type owl:ObjectProperty ;
  rdfs:domain dcat:Distribution ;
  rdfs:range dcterms:MediaTypeOrExtent ;
  rdfs:subPropertyOf dcterms:format ;
.

1. Verify that the range is appropriate and necessary
2. Verify that the domain is appropriate and necessary (see Review global domain axioms on dcat properties #110)
3. Consider whether any guarded constraints (using owl:Restriction) should be introduced (see Use owl:Restriction constraints to bind DC properties to DCAT classes  #105)