query: # highlight objects from KB 
  SELECT DISTINCT 
      ?item ?itemLabel (GROUP_CONCAT(?IsALabel ; separator = " --- ") as ?isEen) ?img ?ascessionnumber ?fulltext ?describedat ?Commonspdf WHERE {
      BIND (wd:Q1526131 AS ?institution)
      ?item p:P195 [ps:P195 ?institution ; pq:P2868 wd:Q29188408 ] .
      OPTIONAL {?item wdt:P31 ?IsA.}
      OPTIONAL {?item wdt:P217 ?ascessionnumber.}
      OPTIONAL { ?item wdt:P18 ?img.}
      OPTIONAL{?item wdt:P953 ?fulltext.}
      OPTIONAL{?item wdt:P973 ?describedat.}
      OPTIONAL{?item wdt:P996 ?Commonspdf.}
    
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". 
                            ?item rdfs:label ?itemLabel.
                            ?IsA rdfs:label ?IsALabel.
                           }  
  } 
  GROUP BY ?item ?itemLabel ?img ?ascessionnumber ?fulltext ?describedat ?Commonspdf 