query: #title: Files should be pdf or djvu
  # Complex constraint from [[Property talk:P7668]]
  # change to [[Property:P304|page(s)&#32;<small dir="ltr">(P304)</small>]] or remove
  SELECT ?item ?itemLabel ?value ?fp 
  {
  	?item p:P996 [ ps:P996 ?value ; pq:P7668 ?fp ]
  	FILTER ( !strends( str(?value), ".djvu") ) 
  	FILTER ( !strends( str(?value), ".pdf") ) 
  	SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }