query: #title: Properties lacking this
  # Complex constraint from [[Property talk:P9073]]
  # External-ID-properties used as reference without P9073. TODO: add P9073 statement to property entity, create item when non-existing
  SELECT 
    ?item ?ms ?msinstance
    # ?itemLabel ?msLabel ?msinstanceLabel
  WHERE
  {
    hint:Query hint:optimizer "None".
    ?item p:P2302 / pq:P5314 wd:Q54828450 . 
    ?item wikibase:propertyType wikibase:ExternalId .
    FILTER NOT EXISTS { ?item p:P9073 ?v9073 }
    OPTIONAL { ?item wdt:P1629 ?ms . ?ms wdt:P31 ?msinstance }
    # SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en" }
  }