A URI "http://purl.org/net/ns/isbn/any_ISBN" identifies a book itself. By dereferencing that URI, you'll be redirected to data URI where you'll get an RDF description of the book, with XLST visual rendaring. See examples: http://purl.org/net/ns/isbn/9784839931957 http://purl.org/net/ns/isbn/9784627829312 http://purl.org/net/ns/isbn/9780062515865 http://purl.org/net/ns/isbn/9780123735560 or try to