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
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