W3C home > Mailing lists > Public > semantic-web@w3.org > June 2007

Re: What if an URI also is a URL

From: Tim Berners-Lee <timbl@w3.org>
Date: Fri, 15 Jun 2007 10:41:06 -0400
Message-Id: <B3AE42FF-9406-4039-9D0B-1D97179B1FFD@w3.org>
Cc: "Pat Hayes" <phayes@ihmc.us>, "M.David Peterson" <m.david@xmlhacker.com>, "r.j.koppes" <rikkert@rikkertkoppes.com>, "Yuzhong Qu" <yzqu@seu.edu.cn>, "Sandro Hawke" <sandro@w3.org>, <semantic-web@w3.org>, <swick@w3.org>
To: "John Black" <JohnBlack@kashori.com>

On 2007-06 -13, at 16:21, John Black wrote:

>>>>  http://www.w3.org/People/Berners-Lee/card#i

> When you de-reference that URI you get a lot of RDF:
>    <con:Male rdf:about="http://www.w3.org/People/Berners-Lee/card#i">
>        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Person"/>
>        <s:label>Tim Berners-Lee</s:label>
>        <con:assistant rdf:resource="http://www.w3.org/People/ 
> Berners-Lee/card#amy"/>
>        <con:homePage rdf:resource="./"/>
>        <con:office rdf:parseType="Resource">
>            <con:address rdf:parseType="Resource">
>                <con:city>Cambridge</con:city>
>                <con:country>USA</con:country>
>            ................ etc.
> If the RDF you get back gives the denotation of the URI, shouldn't  
> you be able to substitute the retrieved RDF anywhere the URI is  
> used in statements? Does this work? If not, why not?

1. The RDF you get back is not itself that which is denoted, it   
information about that which is denoted.

You can't substitute information *about* x for x in general.

2. Could one make a system in which, instead of using a URI, one used  
the set of information about x?

2.a Not really, it is useful that the

2.b Yes, you can for any thing represented by bits xxx in RDF make a  
URI for something using data:

1. Pedantically, you can;t substitute a graph (a form of data value)  
or a representation (the graph bits plus the content type) for a  
symbol in the language.

Received on Friday, 15 June 2007 14:42:16 UTC

This archive was generated by hypermail 2.3.1 : Tuesday, 1 March 2016 07:41:57 UTC