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

Re: statements about a graph (Named Graphs, reification)

From: K-fe bom <u9x3n_15so@hotmail.com>
Date: Wed, 05 Sep 2007 12:02:38 +0000
Message-ID: <BAY114-F37B93485E71B4E8E764999E1CB0@phx.gbl>
To: semantic-web@w3.org




>From: Richard Cyganiak <richard@cyganiak.de>
[...]
>
>I find that making statements about the URI of the document (in your  case, 
>the HTML page containing the RDFa) works for me. It isn't  technically 
>*quite* the same as annotating the named graph, but often  I find it 
>actually more appropriate to make statements about the  document, not the 
>graph.
[...]

That's an easy option. It will probably work on static documents. What 
happens is that in the web there are some 'documents' that consolidate other 
documents. I can think of blogs. The main URL of the blog is the same, but 
its contents will change a lot, with old posts being archived. I supose this 
suggestion wouldn't work with blogs. And there are application servers that 
use and abuse of URLs and provide dynamic content. Portals are a good 
example.

[...]
>I wouldn't worry about statements vs. metastatements. This  distinction is 
>not made in the RDF data model. Metadata is just data.  It's the norm to 
>have RDF documents that contain both metadata and data.

I still think it is preferable to separate the statements. Mainly from a 
data modeling perspective. After Named Graphs they may invent something 
else. And I would like to make fewer assumptions about the location of the 
statements. Perhaps it would be useful to distribute the statements and 
metastatements accross the network in the future.

>
>If your application needs some kind of privileged metadata, which is  
>handled differently from the rest of the data, then you can put that  
>metadata into one or more separate named graphs.

I only need the main data as a graph. In my case I don't see the need to 
group the  metastatements as a unit.



This is good discussion.

thanks,

Gustavo
Received on Wednesday, 5 September 2007 12:02:54 UTC

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