Lee,
On 3 Aug 2009, at 22:30, Kingsley Idehen wrote:
Lee Feigenbaum wrote:
Kingsley Idehen wrote:
Ed Summers wrote:
I was just playing around w/ some SPARQL using dbpedia's
endpoint and
noticed that:
SELECT *
WHERE {
?person rdf:type <http://dbpedia.org/ontology/Person> .
?person rdfs:label ?personName .
?person <http://dbpedia.org/ontology/birthplace> ?place .
?place rdfs:label ?placeName .
FILTER (lang(?personName) = "en")
FILTER (lang(?placeName) = "en")
}
returns some hits but this returns 0:
SELECT COUNT(*)
WHERE {
?person rdf:type <http://dbpedia.org/ontology/Person> .
?person rdfs:label ?personName .
?person <http://dbpedia.org/ontology/birthplace> ?place .
?place rdfs:label ?placeName .
FILTER (lang(?personName) = "en")
FILTER (lang(?placeName) = "en")
}
Is there something wrong here either in my query or my expectation
that the count query return > 0 ?
//Ed
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Ed,
It's your query, you need optionals in there. Here is a quick mod
that focuses on the typical culprits (rdfs:label values):
SELECT COUNT(*)
WHERE {
?person rdf:type <http://dbpedia.org/ontology/Person> .
optional {?person rdfs:label ?personName} .
?person <http://dbpedia.org/ontology/birthplace> ?place .
optional {?place rdfs:label ?placeName} .
FILTER (lang(?personName) = "en")
FILTER (lang(?placeName) = "en")
}
Kingsley, can you explain this further? If Ed's original query (no
optionals) returns results, why would the same query with COUNT(*)
return zero?
Lee
Lee,
I only ran the one that returned zero results, and then added
optionals.
Clearly this is a bug :-(
[Hugh] This issues has been fixed and the dbpedia instance updated,
such that the count query now returns value > 0 (240327 for your
sample query above). Please confirm this works for you now ...
Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support
--
Regards,
Kingsley Idehen Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO
OpenLink Software Web: http://www.openlinksw.com
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