query-4c28bfb04d27ba5af72b8aebd8b98453

PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX schema: <http://schema.org/>
SELECT ?item (SAMPLE(?instanceFilter) AS ?instanceFilter) (COUNT(?link) AS ?links) WHERE {

  # apply territory filter (Milano)
  ?item (wdt:P131*) wd:Q490.

  # item must be an instance of (of any subclass of) something we want
  ?item wdt:P31/wdt:P279* ?instanceFilter.
  VALUES (?instanceFilter) {
      # educational institution
      (wd:Q2385804)

      # park
      (wd:Q22698)
  }

  # exclude items with coordinates or an headquarter or that are deprecated
  MINUS {
    ?item wdt:P625|wdt:P159|wdt:P576 ?unusedinfo.
  } 

  #OPTIONAL {
  # links to Wikimedia projects
    ?link schema:about ?item.
  #}
}
# group by item so we can count their links
GROUP BY ?item

ORDER BY DESC(?links)

LIMIT 100

graph TD classDef projected fill:lightgreen; classDef literal fill:orange; classDef iri fill:yellow; v6("?instanceFilter"):::projected v2("?item"):::projected v5("?link"):::projected v6("?links") v4("?unusedinfo") a1((" ")) c2(["wd:Q490"]):::iri v2 --"wdt:P131"--> c2 v2 --"wdt:P31"--> a1 a1 --"wdt:P279"--> v6 bind0[/VALUES ?instanceFilter/] bind0-->v6 bind00(["wd:Q2385804"]) bind00 --> bind0 bind01(["wd:Q22698"]) bind01 --> bind0 subgraph minus1["MINUS"] style minus1 stroke-width:6px,fill:pink,stroke:red; subgraph union0[" Union "] subgraph union0l[" "] style union0l fill:#abf,stroke-dasharray: 3 3; subgraph union1[" Union "] subgraph union1l[" "] style union1l fill:#abf,stroke-dasharray: 3 3; v2 --"wdt:P576"--> v4 end subgraph union1r[" "] style union1r fill:#abf,stroke-dasharray: 3 3; v2 --"wdt:P159"--> v4 end union1r <== or ==> union1l end end subgraph union0r[" "] style union0r fill:#abf,stroke-dasharray: 3 3; v2 --"wdt:P625"--> v4 end union0r <== or ==> union0l end end v5 --"schema:about"--> v2 bind4[/"sample(?instanceFilter)"/] v6 --o bind4 bind4 --as--o v6 bind5[/"count(?link)"/] v5 --o bind5 bind5 --as--o v6