Hi again,
Thanks for your quick answer.
But I think the data is correct and a query like
select distinct * {
?s <http://dbpedia.org/ontology/birthDate> ?o
filter(?o < "-43-01-01"^^xsd:date)
} limit 10000
Should return persons born before 43 BC, which it does not. I get either person
born in 1 AD (mostly data errors) and even persons born in 1100 AD. So the
filter does not work
Interestingly if I want persons born after 43 BC with
select distinct * {
?s <http://dbpedia.org/ontology/birthDate> ?o
filter(?o > "-43-01-01"^^xsd:date)
} limit 10000
I get only about 20 results (instead of nearly every person)
Is there an error in my sparql query ?
(I tried also filter(?o < "-43"^^xsd:gYear) etc but observed same problem).
Best regard
Johannes
De : Kingsley Idehen [mailto:kide...@openlinksw.com]
Envoyé : jeudi 9 octobre 2014 13:19
À : dbpedia-discussion@lists.sourceforge.net
Objet : Re: [Dbpedia-discussion] years BC problem
On 10/9/14 3:51 AM,
johannes.heine...@orange.com<mailto:johannes.heine...@orange.com> wrote:
Hello
I'm observing a strange ( ?) behaviour on the dbpedia Sparql-endpoint, and I
wonder whether this is due to the underlying data or to the Sparql-endpoint
itself (virtuouso). Following the dumps of dbpedia 2014, the data seems OK
though.
The query
select distinct * {
dbpedia:Cicero
<http://dbpedia.org/ontology/birthDate><http://dbpedia.org/ontology/birthDate>
?o
}
Returns -043-12-07 (7th of July 43 BC) which is what I expected. However
select distinct * {
?s
<http://dbpedia.org/ontology/birthDate><http://dbpedia.org/ontology/birthDate>
?o
filter(?o < "-43-01-01"^^xsd:date)
} limit 100
List all sorts of things (mainly persons though, but none with a birthdate
before 43 BC). Browsing the dbpedia dumps I found several person born before 43
BC.
Does anybody know where this error comes from ?
Best regards
Johannes
Its in the data:
1. http://dbpedia.org/resource/Michael_Jordan
2. http://dbpedia.org/resource/Cicero .
--
Regards,
Kingsley Idehen
Founder & CEO
OpenLink Software
Company Web: http://www.openlinksw.com
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