- From: Ian Davis <lists@iandavis.com>
- Date: Sat, 25 Jun 2011 11:37:18 +0100
- To: Tim Berners-Lee <timbl@w3.org>
- Cc: Xiaoshu Wang <xiao@renci.org>, Jonathan Rees <jar@creativecommons.org>, Alan Ruttenberg <alanruttenberg@gmail.com>, David Booth <david@dbooth.org>, Jeni Tennison <jeni@jenitennison.com>, "www-tag@w3.org List" <www-tag@w3.org>
On Sat, Jun 25, 2011 at 8:18 AM, Tim Berners-Lee <timbl@w3.org> wrote: > > On 2011-06 -24, at 22:24, Xiaoshu Wang wrote: >>> Can I use that URI for statements about a picture? >>> Can I use that URI for statements about Barak Obama? >>> for example. >> >> Yes, either way is fine. > > > In that case, your proposed system is not the WWW, and not the Semantic Web. > It is a different imaginary system, which you are free to develop, but you should not use the term "HTTP". > > In the Semantic Web, I can say > <ex:i> <fb:like> <http://www.knox.edu/Images/_News/news_media/img/2005/obama-barack-1ss.jpg>. > > and it unambiguously means that I like the image, not the person. > This is very valuable. It would be valuable if it were true, but it is not. Firstly, using the same argumentation style that Jonathan employed in response another of Xiaoshu's emails, you have not unambiguously defined ex:i or fb:like and they could mean absolutely anything. Secondly what resource is denoted by the knox.edu URI? I content there are several possibilities: a) the person called "Barack Obama". Perhaps further RDF statements might say that resource is wearing a tie. b) the photograph of that person as originally taken by the camera. Further RDF statements might say who the creator of that photograph was, or talk about the lighting used or the composition. c) the digital version of that photograph, perhaps scanned. Further RDF statements might say the digitisation process or resolution. d) the file format of that digital image. Further RDF statements might state the compression factor, or refer to the EXIF data that JPEGs can have. I think your statement is referring to d) but its' certainly ambiguous in that sense. It can be disambiguated by publishing more data about that URI. If you think I am wrong, then please tell me what this statement means: <ex:i> <fb:like> <http://128.252.39.97/SnapshotJPEG>. Ian
Received on Saturday, 25 June 2011 10:37:45 UTC