Hi all,
Am wondering if anyone might have a suggestion as to why the following
query might be failing when run against the SPARQL endpoint, but work
when executed using SNORQL. After reviewing for a while I am
starting to think that it is due to the comma (,) in the dbpedia.org
resource string. Here's why:
This works via SNORQL:
SELECT ?abstract WHERE { <http://dbpedia.org/resource/Toronto%2C_Ohio>
<http://dbpedia.org/property/abstract> ?abstract. FILTER
langMatches( lang(?abstract), 'en') }
However this doesn't (notice I replaced %2C with (,):
SELECT ?abstract WHERE { <http://dbpedia.org/resource/Toronto,_Ohio> <http://dbpedia.org/property/abstract
> ?abstract. FILTER langMatches( lang(?abstract), 'en') }
The following query, executed via the SPARQL endpoint returns no
results. This is the encoded version of either of the above queries:
SELECT+%3Fabstract+WHERE+%7B+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource
%2FToronto%2C_Ohio%3E+%3Chttp%3A%2F%2Fdbpedia.org%2Fproperty%2Fabstract
%3E+%3Fabstract.+FILTER+langMatches%28+lang%28%3Fabstract%29%2C+%27en
%27%29+%7D
What's I'm guessing is that, the query is being decoded prior to
execution. This decoding is converting the %2C back to a (,) which is
no longer a valid dbpedia resource. Can anyone see an error in how
I'm going about this, or suggest a method of executing this query
against the SPARQL endpoint?
Thanks,
Matthew
Full request / response
POST /sparql HTTP/1.1
Accept-Encoding: identity
Host: dbpedia.org
Content-Type: application/x-www-form-urlencoded
Content-Length: 223
Accept: application/rdf+xml
query=SELECT+%3Fabstract+WHERE+%7B+%3Chttp%3A%2F%2Fdbpedia.org
%2Fresource%2FToronto%2C_Ohio%3E+%3Chttp%3A%2F%2Fdbpedia.org%2Fproperty
%2Fabstract%3E+%3Fabstract.+FILTER+langMatches%28+lang%28%3Fabstract
%29%2C+%27en%27%29+%7DHTTP/1.1 200 OK
Server: Virtuoso/05.11.3039 (Solaris) x86_64-sun-solaris2.10-64 VDB
Connection: Keep-Alive
Date: Thu, 28 May 2009 11:48:20 GMT
Accept-Ranges: bytes
Content-Type: application/rdf+xml; charset=UTF-8
Content-Length: 314
<rdf:RDF xmlns:res="http://www.w3.org/2005/sparql-results#"; xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#
">
<rdf:Description rdf:nodeID="rset">
<rdf:type rdf:resource="http://www.w3.org/2005/sparql-
results#ResultSet" />
<res:resultVariable>abstract</res:resultVariable>
</rdf:Description>
</rdf:RDF>
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