It's confusing when users don't know what success looks like. I have arc2 installed at sites/all/modules/rdf/vendor/arc, everything is as INSTALL.txt says it should be, there are no rdf errors, but all I get is "no success" with no indication where the problem is.

(Perhaps the endpoint could be at drupal.org?)

Comments

bkudrle’s picture

bkudrle commented

Here is an example. This query works to give a list of all people born in Berlin before 1900 that are listed in DBPedia:

PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbo: <http://dbpedia.org/ontology/>

SELECT ?name ?birth ?death ?person WHERE {
?person dbpedia2:birthPlace <http://dbpedia.org/resource/Berlin> .
?person dbo:birthdate ?birth .
?person foaf:name ?name .
?person dbo:deathdate ?death
FILTER (?birth < "1900-01-01"^^xsd:date) .
}

With the SPARQL endpoint of:

http://dbpedia.org/sparql

SamRose’s picture

SamRose commented

The above query does not seem to work as written.

See also:

http://dbpedia.org/snorql/?query=SELECT+%3Fname+%3Fbirth+%3Fdeath+%3Fper...{%0D%0A%3Fperson+dbpedia2%3AbirthPlace+%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FBerlin%3E+.%0D%0A%3Fperson+dbo%3Abirthdate+%3Fbirth+.%0D%0A%3Fperson+foaf%3Aname+%3Fname+.%0D%0A%3Fperson+dbo%3Adeathdate+%3Fdeath%0D%0AFILTER+(%3Fbirth+%3C+%221900-01-01%22^^xsd%3Adate)+.%0D%0A}

SamRose’s picture

SamRose commented

Turned out that it needed more prefixes

I was able to get this to work:


PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT ?name ?birth ?death ?person WHERE {
?person foaf:name ?name.
?person dbpedia2:birthPlace <http://dbpedia.org/resource/Detroit> .
}