# filename: ex228.rq

PREFIX d:   <http://learningsparql.com/ns/data#>
PREFIX e:   <http://learningsparql.com/ns/expenses#> 
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> 

SELECT ?s ?p ?o
WHERE {
  ?s e:amount ?amount;
     ?p ?o . 
  FILTER (?amount < 20) 
}