query: #Alba Amicorum
  SELECT ?item ?itemLabel ?inventorynumber ?KBcatalogURL ?CommonsCategory ?Described_at_URL
  WHERE {
    ?item  p:P31/ps:P31 wd:Q457843 .
    ?item  p:P195/ps:P195 wd:Q1526131.
    OPTIONAL{?item  p:P528/ps:P528 ?catalogcode_PPN.
    BIND(URI(CONCAT("https://resolver.kb.nl/resolve?urn=PPN:", ?catalogcode_PPN)) as ?KBcatalogURL).}
    OPTIONAL{?item  p:P373/ps:P373 ?commonscat.
    BIND(URI(CONCAT("https://commons.wikimedia.org/wiki/Category:", REPLACE(?commonscat, " ", "_", "i"))) as ?CommonsCategory).}
    OPTIONAL{?item  p:P973/ps:P973 ?Described_at_URL.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }