# filename: ex500.rq

PREFIX e: <http://learningsparql.com/ns/expenses#> 

SELECT ?description ?date ?amount
WHERE
{
  ?meal e:description ?description ;
        e:date ?date ;
        e:amount ?amount . 

  VALUES (?date ?description) {
         (UNDEF "lunch") 
         ("2011-10-16" UNDEF) 
  }

}