query: #title: qualifier for identifier should also be available as statement
  # Complex constraint from [[Property talk:P8687]]
  # query currently excludes Twitter
  SELECT ?item ?st ?prop ?qualv
  WITH
  {  SELECT * 
    {
      hint:Query hint:optimizer "None".
      ?item p:P8687 ?st .
      ?st ?qual ?qualv .
      FILTER( ?qual != pq:P585 )  
      FILTER( ?qual != pq:P6552 )
      ?prop wikibase:qualifier ?qual .
      ?prop wikibase:claim ?p .
      ?prop wikibase:statementProperty ?ps .
      MINUS { ?item ?p ?a . ?a ?ps ?qualv }
    }
  } as %all
  WHERE
  {
    INCLUDE %all
    FILTER( datatype(?qualv) = xsd:string ) 
  }