Peter Ansell wrote:
> 2009/11/5 Kingsley Idehen <[email protected]>:
>   
>> Ted Thibodeau Jr wrote:
>>     
>>> Hello, all --
>>>
>>> I've dug a little further...
>>>
>>> The issue is that the English data sets are pretty clean, but the
>>> non-English data sets aren't ... and we loaded all of them into
>>> a single graph, so now the discrepancies are *very* visible.
>>>
>>> We're going to drop the whole kit and reload, partitioning by lang
>>> this time.
>>>
>>> There will be dirty output for a bit, hopefully not more than
>>> a few hours.
>>>
>>> Apologies for the inconvenience.
>>>
>>> Be seeing you,
>>>
>>> Ted
>>>
>>>
>>>
>>>       
>> Just to add to the above.
>>
>> We are going to put each of the language specific data sets in their own
>> Named Graphs. The main DBpedia Graph IRI: <http://dbpedia.org> will be
>> the host of the "en" data set (how its been to date). This also means
>> the default HTML+RDFa based exploration/browser pages will be scoped to
>> the same Graph (as it was pre 3.4).
>>     
>
> What will the GRAPH URI's look like? I tried a query on the
> dbpedia.org endpoint to see if it could find out what graphs were
> present but it refuses to perform the query because it is estimated to
> take too long. [1]
>
> The query was : select distinct ?graph where { graph ?graph { [] ?p ?o
> } } LIMIT 100
>   
We've reverted back to the DBpedia 3.3 mode re. Graph IRIs, so the main 
graph IRI is: <http://dbpedia.org>.

On the other hand, the hot-staged DBpedia-Live [1] instance does have 
the partitioning I mentioned and the quickest route to getting graph 
IRIs is via the /FCT service [2][3].

>   
>> The SPARQL endpoint will support access to all the data across Named
>> Graphs, if your SPARQL patterns aren't scoped to any specific Graph IRI(s).
>>     
Re. DBpedia Live instance, you only need to scope via Graph IRIs in your 
sparql if you want to narrow the scope of our query (IRI wise). 
Otherwise, the DB is indexed to not require Graph IRI specificity of 
yore re. SPARQL queries.
>
> Would this involve the pagelinks set as well? How do I set this
> functionality up on my own virtuoso installation by the way?
>   
You would load the data into Virtuoso and index as per our DBpedia 
guide[4], and you are set.

Links:

1. http://dbpedia-live.openlinksw.com/stats/
2. http://dbpedia-live.openlinksw.com/fct
3. http://tr.im/EFOM -- example of what the /FCT interface delivers re. 
overview of quad store
4. 
http://docs.openlinksw.com/virtuoso/rdfperformancetuning.html#rdfperfgeneraldbpedia
 
-- tunning guide .


Kingsley

> Cheers,
>
> Peter
>
> [1] http://preview.tinyurl.com/ygctx6k
>
>   


-- 


Regards,

Kingsley Idehen       Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com





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