Re: Experiencing problem with DBpedia endpoint

On 4/18/18 10:03 AM, Jean-Claude Moissinac wrote:
> ​Perhaps, a problem that i have already encountered
> Due to performance choices, the virtuoso interface send a response
> after a timeout, even if the response is not complete, and no signal
> is produced to know that the response is not complete
> see https://onsem.wp.imt.fr/2018/04/18/statistics-about-dbpedia-fr/
> for a similar problem​
>
>
> --
> Jean-Claude Moissinac
>

Jean and Peru,


Please read:
https://medium.com/virtuoso-blog/dbpedia-usage-report-as-of-2018-01-01-8cae1b81ca71 
.

Go to the section titled "Virtuoso Anytime Query" which explains our use
of custom response headers in regards to our "fair use" policy for DBpedia.

Kingsley
>
> 2018-04-18 10:47 GMT+02:00 Peru Bhardwaj <peru.bhardwaj@adaptcentre.ie
> <mailto:peru.bhardwaj@adaptcentre.ie>>:
>
>     Dear all,
>
>     I’m experiencing a problem with the DBpedia Virtuoso endpoint on
>     Windows 10 using MS Edge and Chrome.
>
>     I want to execute the following query:
>
>     PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#
>     <http://www.w3.org/2003/01/geo/wgs84_pos#>>
>     PREFIX dbpedia_o: <http://dbpedia.org/ontology/
>     <http://dbpedia.org/ontology/>>
>     PREFIX dbpedia: <http://dbpedia.org/resource/
>     <http://dbpedia.org/resource/>>
>     PREFIX dc: <http://purl.org/dc/terms/>
>     PREFIX dbc: <http://dbpedia.org/resource/Category:
>     <http://dbpedia.org/resource/Category:>>
>     SELECT COUNT(*) WHERE {
>     ?y dct:subject ?subject .
>     OPTIONAL {?y geo:geometry ?geometry}
>     FILTER(REGEX(?subject, "townland", 'i'))
>     }
>
>     All seems to work fine when using snorql
>     (http://dbpedia.org/snorql/), but not when I’m using the interface
>     provided by https://dbpedia.org/sparql. The results are as follows:
>
>     - Snorql in Chrome - 1508
>     - Virtuoso in Chrome - 365
>     - Snorql in Edge - 1508
>     - Virtuoso in Edge - 361
>
>     It seems that the results using snorql (a JavaScript library) are
>     consistent, but something weird happens using the Virtuoso’s
>     interface in Edge and Chrome. The numbers are even different! We
>     were able to recreate the problem on a fresh install of Windows
>     10. Funnily enough, we had no problems using Chrome and MS
>     Explorer on a Windows 8 machine.
>
>     Has anyone encountered this before or confirm whether this is also
>     the case for them? Am I missing something?
>
>     Your help would be much appreciated.
>
>     With my best regards,
>     Peru
>
>

-- 
Regards,

Kingsley Idehen       
Founder & CEO 
OpenLink Software   (Home Page: http://www.openlinksw.com)

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