anchor.diff:    [] ?p ?o.
     FILTER(isLiteral(?o))
   }
  -    
  +
   ....
   4.  Properties
   +
  
positive.code:   ))
  }
  LIMIT 1
        
  ....
  2.  Use HTTP URIs so that people can look up those names
  +
  
negative.code:   GRAPH ?g { ?s owl:sameAs ?o } .
  }
  LIMIT 1
  
  ....
  +
  ....
  