Re: Open world issue (opening vs closing days) and SPARQL CONSTRUCT

Gregory,

Indeed, but I did not proposed that because there is a risk that someone
would like that proposal :)

Best Regards,

Ivan Mikhailov,
http://www.openlinksw.com

On Wed, 2008-05-21 at 12:06 -0400, Gregory Williams wrote:
> On May 21, 2008, at 2:49 AM, Ivan Mikhailov wrote:
> 
> > (:Tuesday :Sunday) is a good approach for non-SPARQL data retrieval,
> > say, for explicit graph traversal. Due to scalability reasons, SPARQL
> > has no features to deal with collections. Hence all what one can do  
> > with
> > SPARQL and (:Tuesday :Sunday) is to retrieve the head of the  
> > collection
> > and access it from application, making negation logic inside the
> > application. That's quite OK if the application is co-located with the
> > data source, otherwise one had to query for sequence items in sequence
> > via net with all related ping times.
> 
> Since there are at most seven items in the list in this example, it  
> should be possible to construct a single SPARQL query using chained  
> OPTIONAL blocks to get all the :closingDays values.
> 
> .greg
>