The query works on a Virtuoso 6 yes :
http://fr.dbpedia.org/sparql?default-graph-uri=&query=select+distinct+count%28%3Fbirth%29+count%28%3Fdeath%29%0D%0Awhere+%7B++++++++++++++%0D%0A++++%3Fentity+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2FbirthDate%3E+%3Fbirth+.+++++%0D%0A++++filter%28datatype%28%3Fbirth%29+%3D+xsd%3Adate%29.%0D%0A++++OPTIONAL+%7B%3Fentity+%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2FdeathDate%3E+%3Fdeath+.%0D%0A++++++++++++filter%28datatype%28%3Fdeath%29+%3D+xsd%3Adate%29.%0D%0A++++%7D%0D%0A%7D&format=text%2Fhtml&timeout=0&debug=on
And even this query :
prefix xsd:
<http://www.w3.org/2001/XMLSchema#><http://www.w3.org/2001/XMLSchema#>
select distinct count(?birth) count(?death)
where {
?entity <http://dbpedia.org/ontology/birthDate> ?birth .
filter(datatype(?birth) = xsd:date).
OPTIONAL {?entity <http://dbpedia.org/ontology/deathDate> ?death .
filter(datatype(?death) = xsd:date).
}
}
Doesn't works. You can try it here : http://data.lirmm.fr:8890/sparql/
Best.
Julien.
2013/10/25 Kingsley Idehen <kide...@openlinksw.com>
> On 10/25/13 11:35 AM, Julien Plu wrote:
>
> select distinct count(?birth) count(?death)
>
> where {
>
> ?entity <http://dbpedia.org/ontology/birthDate> ?birth .
>
> filter(datatype(?birth) = xsd:date).
>
> OPTIONAL {?entity <http://dbpedia.org/ontology/deathDate> ?death .
>
> filter(datatype(?death) = xsd:date).
>
> }
>
> }
>
> And this query return the good results :
>
> select distinct count(?birth) count(?death)
>
> where {
>
> ?entity <http://dbpedia.org/ontology/birthDate> ?birth .
>
> filter(datatype(?birth) =
> "http://www.w3.org/2001/XMLSchema#date<http://www.w3.org/2001/XMLSchema#string>
> ").
>
> OPTIONAL {?entity <http://dbpedia.org/ontology/deathDate> ?death .
>
> filter(datatype(?death) = "
> http://www.w3.org/2001/XMLSchema#date<http://www.w3.org/2001/XMLSchema#string>
> ").
>
> }
>
> }
>
>
> Have-I missed something or is-it really a bug from Virtuoso 7 ?
>
> It's a bug if you don't have this issue when using Virtuoso 6. That said,
> I would expect the following to work:
>
> prefix xsd:
> <http://www.w3.org/2001/XMLSchema#><http://www.w3.org/2001/XMLSchema#>
>
> select distinct count(?birth) count(?death)
>
> where {
>
> ?entity <http://dbpedia.org/ontology/birthDate> ?birth .
>
> filter(datatype(?birth) = xsd:date).
>
> OPTIONAL {?entity <http://dbpedia.org/ontology/deathDate> ?death .
>
> filter(datatype(?death) = xsd:date).
>
> }
>
> }
>
> Proof:
>
> 1. http://kingsley.idehen.net/c/DBYF6E -- query against LOD Cloud Cache .
>
>
> --
>
> Regards,
>
> Kingsley Idehen
> Founder & CEO
> OpenLink Software
> Company Web: http://www.openlinksw.com
> Personal Weblog: http://www.openlinksw.com/blog/~kidehen
> Twitter/Identi.ca handle: @kidehen
> Google+ Profile: https://plus.google.com/112399767740508618350/about
> LinkedIn Profile: http://www.linkedin.com/in/kidehen
>
>
>
>
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