[redland-dev] [Rasqal RDF Query Library 0000610]: Error with DBpedia and Wikidata SPARQL endpoints

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://bugs.librdf.org/mantis/view.php?id=610 
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Reported By:                aharth
Assigned To:                
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Project:                    Rasqal RDF Query Library
Issue ID:                   610
Category:                   query engine
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Query Language:              
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Date Submitted:             2016-06-02 05:07
Last Modified:              2016-06-02 05:07
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Summary:                    Error with DBpedia and Wikidata SPARQL endpoints
Description: 
I cannot access DBpedia/Wikidata SPARQL endpoints with roqet (Debian testing).

SELECT on Wikidata work:

$ roqet -p https://query.wikidata.org/sparql -e "SELECT  ?s ?p ?o   WHERE { ?s
?p ?o . } LIMIT 1" 

CONSTRUCT on Wikidata does not work:

$ roqet -p https://query.wikidata.org/sparql -e "CONSTRUCT { ?s ?p ?o . } WHERE
{ ?s ?p ?o . } LIMIT 1" 
roqet: Calling SPARQL service at URI https://query.wikidata.org/sparql with
query 'CONSTRUCT { ?s ?p ?o . } WHERE { ?s ?p ?o . } LIMIT 1'
UNKNOWN element RDF
UNKNOWN element Description
UNKNOWN element P1629
UNKNOWN element P1629
UNKNOWN element Description
UNKNOWN element RDF
roqet: Query has a variable bindings result
roqet: Query returned 0 results
$

I've tried different values for -r, but to no avail.

Queries on DBpedia do not work at all:

$ roqet -p http://dbpedia.org/sparql -e "SELECT ?s WHERE { ?s a
<http://xmlns.com/foaf/0.1/Organization> . } LIMIT 1" roqet: Calling SPARQL
service at URI http://dbpedia.org/sparql with query 'SELECT ?s WHERE { ?s a
<http://xmlns.com/foaf/0.1/Organization> . } LIMIT 1'
roqet: Error - URI
http://dbpedia.org/sparql?query=%53E%4CEC%54+%3F%73+%57%48E%52E+%7B+%3F%73+a+%3C%68%74%74%70%3A%2F%2F%78%6D%6C%6E%73.c%6F%6D%2Ff%6Faf%2F0.1%2F%4F%72%67a%6E%69%7Aa%74%69%6F%6E%3E+.+%7D+%4C%49%4D%49%54+1
- Resolving URI failed with HTTP status 404
roqet: Error -  - Failed to fetch retrieval URI
http://dbpedia.org/sparql?query=%53E%4CEC%54+%3F%73+%57%48E%52E+%7B+%3F%73+a+%3C%68%74%74%70%3A%2F%2F%78%6D%6C%6E%73.c%6F%6D%2Ff%6Faf%2F0.1%2F%4F%72%67a%6E%69%7Aa%74%69%6F%6E%3E+.+%7D+%4C%49%4D%49%54+1
roqet: Query has a variable bindings result
roqet: Query returned 0 results
$

But I can access the URI via curl...
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Issue History 
Date Modified    Username       Field                    Change               
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2016-06-02 05:07 aharth         New Issue                                    
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