query: #Churches in church district Wittenberg
  #defaultView:Map{"layer": "?pbLabel"}
  SELECT ?item ?itemLabel ?pbLabel (SAMPLE(?cat) AS ?cat) (SAMPLE(?coord) AS ?coord) (SAMPLE(?img) AS ?img)
  WHERE {
    wd:Q75849591 wdt:P527 [ wdt:P527 ?item; wdt:P361 ?pb ].
    ?pb wdt:P31 wd:Q76598130.
    ?item wdt:P625 ?coord.
    OPTIONAL { ?item wdt:P373 ?cat. }
    OPTIONAL { ?item wdt:P18 ?img. }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "de". }
  } GROUP BY ?item ?itemLabel ?pbLabel