Hi,
I've got a problem querying public DBpedia sparql endpoint (
http://dbpedia.org/sparql). Everything works fine when I use the web
interface to run the query. Problem occurs when I want to execute the same
query through my application. I'm using the HTTP POST method to pass the
input encoded query but the server response is "*500 SPARQL Request
Failed"*with following message included:
*RDFXX Error Unknown language in DB.DBA.RDF_LANGUAGE_OF_LONG, bad id 0*
*
*
My query looks like this:
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX db-prop: <http://dbpedia.org/property/>
PREFIX db-ont: <http://dbpedia.org/ontology/>
PREFIX geo: <http://www.w3.org/2003/01/geo/wgs84_pos#>
SELECT DISTINCT ?subject ?label ?comment ?homepage ?page ?thumb ?photo
?latlong
(sql:rnk_scale (<LONG::IRI_RANK> (?subject))) AS ?rank
WHERE
{
?subject rdfs:label ?label .
OPTIONAL { ?subject rdfs:comment ?comment } .
OPTIONAL { ?subject foaf:homepage ?homepage } .
OPTIONAL { ?subject foaf:page ?page } .
OPTIONAL { ?subject db-ont:thumbnail ?thumb } .
OPTIONAL { ?subject db-prop:hasPhotoCollection ?photo } .
OPTIONAL { ?subject geo:geometry ?latlong } .
FILTER(bif:contains(?label, '"berlin"') && langMatches(lang(?label), "en")
&& langMatches(lang(?comment), "en")) .
}
ORDER BY DESC(?rank)
LIMIT 3
Thank you for your help
Zbynek Botlo
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