Re: [dxwg] Question: how to catalog relational database data in DCAT? (#1240)

Another serialization option, putting the extensions in the dcat:endpointDescription, which takes a value rdfs:resource. 

```
a:dataset-004 a dcat:Dataset ; 
  dct:title "Example Relational Database"@en ;
  dct:description "individual tables and views are accessible as separate distributions via jdbc connections" @en ;
  dcat:distribution [ a dcat:Distribution ;
    dct:title "access table 005: THE_TABLE_NAME";
    dcat:accessService a:table-service-005 
  ] .

a:table-service-005
  rdf:type dcat:DataService ;
  dct:title "access table 005: THE_TABLE_NAME";
  dct:conformsTo <https://www.cybele-project.eu/relationaltableprofile> ;
  dct:type <(https://www.cybele-project.eu/table/view> ;
  dcat:endpointDescription [
	  ex:accessDatabase [ a ex:Database ;
		  ex:connectionString "jdbc:oracle:thin:@​hostname:1521:my-database";
		  ex:tableName "THE_TABLE_NAME"
		]
  ]	;
  dcat:servesDataset a:dataset-004 .
```

Should work as long as ex:accessDatabase subclasses from rdfs:Resource.  Nothing is inconsistent with DCAT

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