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Re: Datasets and contextual/temporal semantics

From: Jeremy Carroll <jeremy@topquadrant.com>
Date: Thu, 13 Oct 2011 18:59:24 -0700
Message-ID: <4E97977C.3080009@topquadrant.com>
To: public-rdf-wg@w3.org
On 10/13/2011 4:49 PM, Pat Hayes wrote:
> Factual data that is time-dependent but not given with time information is bad.
This is a non-issue.

On the WEB it is not possible to publish any information without also 
giving some time-information. The HTTP headers have it.

Essentially, we have two graphs of interest - the graph on the server, 
and the graph on the client. The graph on the client is a cached copy of 
the graph on the server, and the considerations of:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13
apply



(I do not know if any semantic web implementers have taken this point of 
view, but whether or not there is implementation experience, this seems 
to be to have been standardized long ago).

A Graph that says that Alice is 29, when in fact she is 30, and the 
updated information is available from the Graph's document URL is a 
stale cached copy that should be discarded. If a particular 
implementation does not have the mechanisms to check the HTTP headers to 
work this out, then that implementation is faulty, and it needn't 
concern us in this WG, other than we might wish to write  a test case. 
(And we might also wish to fix our code).

Jeremy
Received on Friday, 14 October 2011 01:59:49 GMT

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