Nope, there is no mismatch. SPARQL just doesn't give a minimal answer, since it would be too expensive. In other words, SPARQL may give different (but equivalent) answers to equivalent graphs. Check out my PODS-2006 invited talk slides at <http://www.inf.unibz.it/~franconi/papers/franconi-slides-pods-2006.pdf>. cheers --e. On 24 Apr 2012, at 22:13, Juan Sequeda wrote: > This is a non lean RDF graph and per the RDF semantics, they are equivalent. > > Gotta love the RDF semantics. > > So, even though they are equivalent per RDF semantics, we still maintain the cardinality. But if we query in SPARQL, we get two different things. Therefore, there is a mismatch between the semantics of SPARQL and RDF. Interesting, eh? > > Juan Sequeda > www.juansequeda.com > > On Apr 24, 2012, at 9:53 PM, David McNeil <dmcneil@revelytix.com> wrote: > >> On Tue, Apr 24, 2012 at 1:44 PM, Richard Cyganiak <richard@cyganiak.de> wrote: >> _:1 <IOU#BORROWER> "Alice". >> _:1 <IOU#AMOUNT> 10. >> _:2 <IOU#BORROWER> "Alice". >> _:2 <IOU#AMOUNT> 10. >> >> Maybe I don't understand blank nodes properly. I thought the graph above was asserting the existence of two unique resources (since there are two blank node IDs). >> >> Thanks. >> -David
Received on Tuesday, 24 April 2012 21:12:23 UTC