Re: representing null in semantic frameworks

There is something close. rdf:Lists terminate with a null I think.

Henry

On 20 Oct 2007, at 18:15, Garret Wilson wrote:

>
> As RDF evolved, was there any discussion on adding an rdf:null  
> resource---that is, a resource that represents no resource at all?
>
> One expected response: "My child, you're thinking like a programmer  
> again---what you really want to do is assert the absence of any  
> assertions regarding a particular subject and predicate, or you  
> want to assume a closed world and just don't assert anything at  
> all", or something like that---and I appreciate this point of view  
> to some extent.
>
> But as a practical matter, let's say we have a list of baseball  
> game scores. Wouldn't it be convenient for the resource at index 3  
> to be null to indicate that there was no score that week because  
> there was a tornado that canceled the game?
>
> I'm not necessarily looking for a big online discussion. Just a  
> brief pointer to any reading on this subject would help. I'm sure  
> there must have been some discussion of null over the development  
> history of RDF.
>
> Thanks,
>
> Garret