some problems in profile.ttl

[VladimirAlexiev]

• Spawned from prof:hasArtifact use of xsd:anyURI #553
• We're looking for prof:hasArtifact use of xsd:anyURI Sveino/Inst4CIM-KG#89

@nicholascar I see a couple of problems with https://github.com/opengeospatial/ogc-geosparql/blob/master/profile.ttl#L155-L170

<http://www.opengis.net/ont/geosparql>
    a prof:ResourceDescriptor ;
    dcterms:description "The GeoSPARQL 1.1 ontology in RDF (turtle)"@en ;
    dcterms:format "text/turtle" ;
    dcterms:title "GeoSPARQL Ontology"@en ;
    prof:hasArtifact "https://github.com/opengeospatial/ogc-geosparql/master/1.1/geo.ttl"^^xsd:anyURI ;
    prof:hasRole role:schema ;
.

<http://www.opengis.net/ont/geosparql.json>
    a prof:ResourceDescriptor ;
    dcterms:description "The GeoSPARQL 1.1 ontology in RDF (JSON-LD)"@en ;
    dcterms:format "application/ld+json" ;
    dcterms:title "GeoSPARQL Ontology"@en ;
    prof:hasArtifact "https://github.com/opengeospatial/ogc-geosparql/master/1.1/geo.json"^^xsd:anyURI ;
    prof:hasRole role:schema ;
.

• All examples in https://www.w3.org/TR/dx-prof/ use URLs rather than anyURI literals, eg:

prof:hasArtifact <http://test.linked.data.gov.au/test/def/CSIRO-ePub-DCAP/HowTo.pdf>
prof:hasArtifact ex1:constraints.json 

• Nothing says that <http://www.opengis.net/ont/geosparql> and <http://www.opengis.net/ont/geosparql.json> are two renditions of the same thing, and a user of the profile only needs to use one of them. dcat:Distribution can express that: different renditions of the same Dataset
• <http://www.opengis.net/ont/geosparql> is in fact owl:Ontology. Is it ok to also say that it's a prof:ResourceDescriptor (of itself)?
• http://www.opengis.net/ont/geosparql redirects to https://opengeospatial.github.io/ogc-geosparql/geosparql11/geo.ttl, which returns actual Turtle. So it's a better artifact than https://github.com/opengeospatial/ogc-geosparql/master/1.1/geo.ttl, which is a webpage showing turtle source