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Re: Cool URIs, the Semantic Web and Everything

From: Story Henry <henry.story@bblfish.net>
Date: Sun, 23 Dec 2007 11:56:36 -0200
Cc: "Richard Cyganiak" <richard@cyganiak.de>, "Leo Sauermann" <sauermann@dfki.uni-kl.de>, <semantic-web@w3.org>, "Leo Sauermann" <leo.sauermann@dfki.de>
Message-Id: <1808BCBE-AFEE-46B9-BB5E-71E79E3B018D@bblfish.net>
To: "Hausenblas, Michael" <michael.hausenblas@joanneum.at>
It is not easy to make these distinctions when written down in a  
natural language which is very flexible and where the context make all  
the difference on how something is interpreted.

That is why we develop more formal languages such as N3 to make it  
clear what we are speaking about.

"http://sw-app.org/mic.xhtml#i"^^xsd:anyURI a web:URI, web:URL .
That is a necessary truth.

what  <http://sw-app.org/mic.xhtml#i> refers to is not known a priori.  
One has to GET it to find out.

I don't know RDFa well, but let assume it is well written, then

<http://sw-app.org/mic.xhtml#i> a foaf:Person;
       foaf:name "Miachel Hausenblas" .

If you have a html fragment #i in your html then you may have a  
contradictory representation and we would not be able to determine  
what it refers to. That is if you believe that in html the URL refers  
to something directly. But you may think that it only refers to  
something indirectly. ie:

[ a :Representation;
   :content "<!DOCTYPE html P...";
   :regexContains "id=i";

Ie the representation can be searched for the string, and the dom
tree can be searched for such a syntactical structure. But the URL
<http://sw-app.org/mic.xhtml#i> does not refer to those things.

Since it is a complex issue, and in order to avoid wasting time  
thinking about this too heavily, it is better to use a different id  


On 23 Dec 2007, at 06:22, Hausenblas, Michael wrote:

> Q.I: What is http://sw-app.org/mic.xhtml#i?
> 1. A URI
> 2. A URL
> 3. A foaf:Person
> 4. Michael Hausenblas
> 6. An XHTML fragment
> Q.II:  What does http://sw-app.org/mic.xhtml#i identfiy?
> 1. A foaf:Person
> 2. Michael Hausenblas
> 4. An XHTML fragment
> 5. Depends on who looks at it: A Web UA 'sees' a XHTML fragment,
>   a SW agent a thing of type foaf:Person
> 6. Dunno until I do an HTTP GET

Received on Sunday, 23 December 2007 13:58:14 UTC

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