- From: Richard Cyganiak <richard@cyganiak.de>
- Date: Sat, 7 Jun 2008 10:25:07 +0100
- To: Phil Archer <parcher@icra.org>
- Cc: SWIG <semantic-web@w3.org>
- Message-Id: <EFB69D5B-9451-484F-BF7A-109FEE5A1520@cyganiak.de>
Phil, This is a very interesting question, thanks for rising it. On 6 Jun 2008, at 09:57, Phil Archer wrote: > Suppose I have this triple > > <http://example.org/> ex:colour "red" > > and when I dereference the URI I get a 302 redirect to http://www.example.org/home.asp > . > > Do I know what colour http://www.example.org/home.asp is? I don't want to dig too deeply into this, but here's an explanation that makes sense to me. This is an interpretation that is not fully supported by the wording of the specs, but to me it seems to be the most sane one. An HTTP GET to a URI means 撤lease give me a representation of yourself.? A 302 response means: 的 can't or don't want to give you a representation of myself, but you can get a representation of myself over there.? The important point in this interpretation: 302 from A to B means that you get a *representation of A* by doing a *GET on B*. With this interpretation, we cannot deduce anything about B from the interaction, except that among its representations there is one that is also a representation of A. We cannot deduce any owl:sameAs or whatever else from the redirection. The only deduction we can make from an HTTP redirect is 鄭 http:redirectsTo B?. I strongly prefer this interpretation because it keeps the layering of the SemWeb *on top of* HTTP intact. Configuring the HTTP responses of a URI should *only* determine what representations clients can access, *not* what the resource is. (With the single additional constraint of httpRange-14, that only a special class of things called web documents can have representations, and having representations of other things like people is a form of unhealthy punning that is best avoided.) So, in my eyes, you don't know the color of <http://example.com/ home.asp> unless the RDF you get back from there tells you the color. Richard > > > I'm pretty sure the answer's no, but has anyone else grappled with > the joys of redirects in this way? > > Phil. > > -- > Phil Archer > Chief Technical Officer, > Family Online Safety Institute > w. http://www.fosi.org/people/philarcher/ > > > >
Received on Saturday, 7 June 2008 09:25:44 UTC