redskate
commented
6 years ago What I would like to compose and successfully execute is the following query:
#BPedia
prefix skos:<http://www.w3.org/2004/02/skos/core#>
prefix dbc: <http://dbpedia.org/resource/Category:>
prefix dct: <http://purl.org/dc/terms/>
prefix dbr: <http://dbpedia.org/resource/>
prefix dbp: <http://dbpedia.org/property/>
#Europeana
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX edm: <http://www.europeana.eu/schemas/edm/>
PREFIX ore: <http://www.openarchives.org/ore/terms/>
SELECT *
{
?musiker dct:subject dbc:Baroque_composers ;
foaf:surname ?surname .
SERVICE <http://sparql.europeana.eu/> {
SELECT *
WHERE {
?CHO ore:proxyIn ?proxy;
dc:title ?title ;
dc:creator ?creator ;
dc:date ?date .
FILTER REGEX(str(?creator),str(?surname),"i").
?proxy edm:isShownBy ?mediaURL .
} limit 100
}
} limit 100Which is so much to say: 1) search for composer names in DBPedia, then 2) search in Europeana for some works of them. This in order to DEMONSTRATE for a university, that the SERVICE functions... I choosed Blazegraph because I think it is a great engine. Unluckily I cannot manage to get this SERVICE running so easily.
thompsonbry
kappagithub
Dear Blazegraph community
I am using bigdata.war version 2.1.5 (but also with 2.1.4 the following error arose) and I need to formulate a federated query getting data from a blazegraph instance running on https://ch.semweb.ch:8433/bigdata
The Query I am using is the following:
Although <https://ch.semweb.ch:8433/bigdata/namespace/DBPedia/sparql> is a valid URI, the querying RDF store issues an error (whose text is probably wrong) saying:
Unknown error: Service URI https://ch.semweb.ch:8433/bigdata/namespace/DBPedia/sparql is not allowed ???
The same query but using <http://dbpedia.org/sparql> as a SERVICE URI is running well.
But this Service URI should indeed be allowed. What am I doing wrong? How can I get the results ? How should I configure bigdata in order to "allow" this URI in the SERVICE query from "OUTSIDE"? The query was called inside https://query.wikidata.org/ which uses again a blazegraph engine. Using virtuoso gives another error (see below).
This must be a problem using that URI - bigdata server (https://ch.semweb.ch:8433/bigdata) seems (from the logs) not even to get a request. ... no log reaction.
Thanks in advance Regards Fabio
PS: The exception reported using wikidata sparql server is:
PS: The warning reported calling that query from virtuoso (http://dbpedia.org/sparql) is: