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

:book1  dc:title  "SPARQL Tutorial" . 
:book1  ns:price  42 .
:book2  dc:title  "The Semantic Web" . 
:book2  ns:price  23 .