query: #title: Properties should not be (sub)classes
  # Complex constraint from [[Property talk:Properties/Constraints]]
  # Properties are instances ([[Property:P31|instance of&#32;<small dir="ltr">(P31)</small>]]) but not subclasses ([[Property:P279|subclass of&#32;<small dir="ltr">(P279)</small>]]) of something
  SELECT ?property WHERE {
    ?property wikibase:propertyType ?type .
    ?property wdt:P279 ?class .
  }