query: #title: Value shouldn't be an item for a date
  # Complex constraint from [[Property talk:P248]]
  # use [[Property:P813|retrieved&#32;<small dir="ltr">(P813)</small>]] or [[Property:P577|publication date&#32;<small dir="ltr">(P577)</small>]] instead
  SELECT ?item ?itemLabel ?p ?value ?valueLabel
  {
  ?item ?p [ prov:wasDerivedFrom / pr:P248 ?value ] .
  ?value wdt:P31 wd:Q47150325 . SERVICE wikibase:label { bd:serviceParam wikibase:language "en"  }    
  }
  LIMIT 2000