anchor.diff:    { [] rdfs:subclassOf ?c. }
   }
   LIMIT 100
  -    
  +
   ....
   +
   ....
  
positive.code: ....
  SELECT COUNT(*) AS ?c
  WHERE {?s ?p ?o}
    
  ....
  +
  When the number of statements is not changed, we retrieve the first and
  
negative.code: }
  LIMIT 1
  OFFSET 100
  
  ....
  4.  Include links to other URIs. so that they can discover more things
  +
  