PREFIX dc:   <http://purl.org/dc/elements/1.1/> 
PREFIX :     <http://example.org/book/> 
PREFIX ns:   <http://example.org/ns#> 

SELECT ?book ?title ?price
{
   ?book dc:title ?title ;
         ns:price ?price .
}
BINDINGS ?book {
 (:book1)
}