Re: My action item on Moby Dec, issue 14, etc

Am Freitag den, 20. September 2002, um 20:52, schrieb Roy T. Fielding:

>> Even seen it asserted in many places that a URI unambiguously 
>> identifies a
>> single resource. I've not seen it asserted the other way round... 
>> that a
>> resource is identified by a single URI. Such an assertion might be a
>> consequence of a definition of resource like Roy's about a 
>> resource being a
>> conceptual mapping over time between an identifier and a set of 
>> time varying
>> equivalent representations.
> Nope, it is N:1.  My definition of a resource does not say how many URI
> identify that resource.  I don't even mention them in the same 
> paragraph.

In another thread on the uri list, you pointed out that:

"The mapping [of URIs] is the resource and the resource always 

In terms of Tim Bray's alternatives (either the resource is the uri (a)
or it is a separate concept(b)) you seem to allow for both to be true.

I get the feeling I missed something here. Could you explain?



>>> An N:1 mapping of a URI to a Resource
>>> would require some way to determine more information about a Resource
>>> other than its URI and that information does not exist at this layer
>>> of the architecture.
> No it wouldn't -- it merely recognizes their existence so that such
> understanding can be used at other layers.  HTTP had a mechanism at one
> point that would have provided information about the other N, but it
> was removed due to lack of consensus.  CDN depends on similar notions.
> Besides, right now we are talking about a document that already covers
> many layers at the same time.
> .....Roy

Received on Monday, 23 September 2002 06:58:21 UTC