query: #Libraries in Japan
  SELECT ?item ?itemLabel ?isil WHERE {
    ?item (wdt:P31/wdt:P279*) wd:Q7075.
    ?item wdt:P17 wd:Q17.
    OPTIONAL { ?item wdt:P791 ?isil. }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }