W3C home > Mailing lists > Public > semantic-web@w3.org > October 2005

RE: New Intro to RDF

From: Hammond, Tony <T.Hammond@nature.com>
Date: Tue, 4 Oct 2005 09:50:04 +0100
Message-ID: <125F7834E11A5741A7D79412EE3504F91D08CA2F@UK1APPS2.mpl.root-domain.org>
To: 'Joshua Tauberer' <tauberer@for.net>, 'SWIG' <semantic-web@w3.org>

Hi Joshua:

Looks to be an excelent introduction to RDF. I will look forward to reading
it. One thing you may want to change, though, throughout is your use of
'urn:' URIs. The '/' character is specifically reserved in 'urn:' syntax -
see extract below from RFC 2141. That is, '/' in URI syntax is a hierarchy
delimiter and hierarchy is not expressed as such in 'urn:' URIs. Also the
construct 'urn://global/name/own' would make 'global' a network authority.
'urn:' does not express network authorities, but rather URN namespaces, e.g.





2.3 Reserved characters

   The remaining character set left to be discussed above is the
   reserved character set, which contains various characters reserved
   from normal use.  The reserved character set follows, with a
   discussion on the specifics of why each character is reserved.

   The reserved character set is:

   <reserved>    ::= '%" | "/" | "?" | "#"


> -----Original Message-----
> From: semantic-web-request@w3.org 
> [mailto:semantic-web-request@w3.org] On Behalf Of Joshua Tauberer
> Sent: 03 October 2005 23:23
> To: 'SWIG'
> Subject: New Intro to RDF
> Hi,
> As probably everyone on the list knows, there's a lot of negative 
> opinions of RDF out there, and it seems like some of this 
> stems from a 
> confusion of RDF the XML format and RDF the general method for 
> expressing knowledge.  But, I haven't come across a deep 
> explanation of 
> what RDF-the-method is that we can point people to so they 
> know there's 
> more to RDF than the serialization format.
> I know such a document may very well exist, but I figured I 
> would take a 
> stab at writing one myself.  (If it has no value for anyone else, at 
> least I gained a deeper understand of RDF by writing it :-).  What I 
> wrote is posted at:
> http://taubz.for.net/code/semweb/whatisrdf/
> The goal was to introduce RDF from the beginning, show why 
> it's useful 
> for modeling knowledge in a distributed way, and to give a basic 
> presentation of RDFS and OWL.
> It's long for an introduction as I tried to be as explicit as 
> possible 
> about what defines RDF (at least in my understanding of RDF). 
>  A shorter 
> to-the-point version could be synthesized from this.
> Comments welcome, especially if you think it was worth the 
> time writing.  :)
> -- 
> - Joshua Tauberer
> http://taubz.for.net
> ** Nothing Unreal Exists **

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Received on Tuesday, 4 October 2005 08:50:43 UTC

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