query-aae15b4f93a8ac8877b1667d4714870d

rq turtle/ttl

Map projections of: (P31)instance of ) is a (Q309372)Mercator projection Wikidata is confused. The Mercator projection ().(Q1522071)conformal map projection conformal projection ( ), and(Q2077983)cylindrical projection cylindrical projection ( ),(Q186386)map projection map projection ((On 1 July 2020, the instance of map projection was dropped, so the item is just a subclass of the others.) A cylindrical projection is both an instance of and a subclass of map projection. (The cylindrical projection was also fixed on 1 July 2020.) Is that trying to say there is a trivial cylindrical projection, and there are other, more complicated, projections? But then there should be two items: one for the instance and one for the class. We are back to the typeface problem. ) makes more sense. I have trouble with a system that leads to an instance of an instance. A map might use an instance of a Mercator projection which is itself an instance of a map projection. If I want to make a list of different map projections, then a query that asks for all instances of a map projection would return the instance that map used. That is not the answer I want. If Mercator projection were a subclass of map projection, then I'd ask for all subclasses of map projection. I should get the Mercator projection without specific instances of the Mercator projection. (P279)subclass of Using subclass of (

Use at

• https://query.wikidata.org/sparql

PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX bd: <http://www.bigdata.com/rdf#>
SELECT ?item ?itemLabel
{
  # instance of a map projection
  ?item wdt:P31/wdt:P279* wd:Q186386 .

  SERVICE wikibase:label {
     bd:serviceParam wikibase:language "en" .
  }
} ORDER BY ?itemLabel

Query found at

• https://www.wikidata.org/wiki/User:Glrx