I'm sorry, Lorenz,
but I cannot obtain the exception RiotException that you have.
I tried this Java code:
import org.apache.jena.graph.Graph;
import org.apache.jena.riot.RDFDataMgr;
public class ReadMgr {
public static void main(String[] args) {
try {
Graph g = RDFDataMgr.loadGraph("http://dbpedia.org/resource/Rome
");
System.out.println("size " + g.size());
} catch (Throwable e) {
System.err.println(e);
}
}
}
It just says "size 0" .
My SBT config (Maven like ) is:
libraryDependencies += "org.apache.jena" % "apache-jena-libs" % "*3.1.1*"
2017-01-19 10:05 GMT+01:00 Lorenz B. <[email protected]>:
> Hi,
>
> can you clarify what doesn't work?
>
> I tried your example and it would work, but I'm getting a parse
> exception because DBpedia (resp. Virtuoso) still returns illegal data:
>
> Graph g = RDFDataMgr.loadGraph("http://dbpedia.org/resource/Rome";);
> System.out.println(g.size());
>
>
> [line: 1863, col: 13] Failed to find a prefix name or keyword:
> –(8211;0x2013)
> Exception in thread "main" org.apache.jena.riot.RiotException: [line:
> 1863, col: 13] Failed to find a prefix name or keyword: –(8211;0x2013)
> at
> org.apache.jena.riot.system.ErrorHandlerFactory$ErrorHandlerStd.fatal(
> ErrorHandlerFactory.java:136)
> at
> org.apache.jena.riot.lang.LangEngine.raiseException(LangEngine.java:165)
> at org.apache.jena.riot.lang.LangEngine.nextToken(LangEngine.java:108)
> at
> org.apache.jena.riot.lang.LangTurtleBase.triples(LangTurtleBase.java:248)
> at
> org.apache.jena.riot.lang.LangTurtleBase.triplesSameSubject(
> LangTurtleBase.java:190)
> at
> org.apache.jena.riot.lang.LangTurtle.oneTopLevelElement(
> LangTurtle.java:46)
> at
> org.apache.jena.riot.lang.LangTurtleBase.runParser(LangTurtleBase.java:89)
> at org.apache.jena.riot.lang.LangBase.parse(LangBase.java:42)
> at
> org.apache.jena.riot.RDFParserRegistry$ReaderRIOTLang.read(
> RDFParserRegistry.java:179)
> at org.apache.jena.riot.RDFDataMgr.process(RDFDataMgr.java:861)
> at org.apache.jena.riot.RDFDataMgr.parse(RDFDataMgr.java:667)
> at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:212)
> at org.apache.jena.riot.RDFDataMgr.read(RDFDataMgr.java:105)
> at org.apache.jena.riot.RDFDataMgr.loadGraph(RDFDataMgr.java:346)
>
>
>
>
> If there is no parsing error (e.g.http://dbpedia.org/resource/Mars works
> for me) the result is as expected:
>
>
> Graph g = RDFDataMgr.loadGraph("http://dbpedia.org/resource/Mars";);
> System.out.println(g.size());
>
> Output: 347
>
>
> The issue was already reported by me, see [1], and [2]
>
> [1] https://github.com/openlink/virtuoso-opensource/issues/567
> [2] https://github.com/openlink/virtuoso-opensource/issues/569
>
>
>
> Kind regards,
> Lorenz
>
> > Reading a dbPedia resource with e.g. RDFDataMgr.loadGraph() does not
> > currently work (it used to work with Jena 3.1.1 ).
> > Apparently this is because of the 303 redirection.
> > Is there another call in Jena API to handle redirections and accepting
> RDF
> > MIME types ?
> >
> > wget --save-headers --header='Accept: application/rdf+xml'
> > http://dbpedia.org/resource/Rome
> > --2017-01-19 09:30:08-- http://dbpedia.org/resource/Rome
> > Résolution de dbpedia.org (dbpedia.org)… 194.109.129.58
> > Connexion à dbpedia.org (dbpedia.org)|194.109.129.58|:80… connecté.
> > requête HTTP transmise, en attente de la réponse… *303 See Other*
> > Emplacement : http://dbpedia.org/data/Rome.xml [suivant]
> > --2017-01-19 09:30:08-- http://dbpedia.org/data/Rome.xml
> > Réutilisation de la connexion existante à dbpedia.org:80.
> > requête HTTP transmise, en attente de la réponse… 200 OK
> > Taille : 1003627 (980K) [application/rdf+xml]
> > Enregistre : «Rome.2»
> >
> > less Rome.2
> > HTTP/1.1 200 OK
> > Date: Thu, 19 Jan 2017 08:30:08 GMT
> > Content-Type: application/rdf+xml; charset=UTF-8
> > Content-Length: 1003627
> > Connection: keep-alive
> > Vary: Accept-Encoding
> > Server: Virtuoso/07.20.3217 (Linux) i686-generic-linux-glibc212-64 VDB
> > Expires: Thu, 26 Jan 2017 08:30:08 GMT
> > Link: <http://creativecommons.org/licenses/by-sa/3.0/>;rel="license",<
> > http://dbpedia.org/data/Rome.n3>; rel="alternate"; type="text/n3";
> > title="Structured Descriptor Document (N3/Turtle format)", <
> > http://dbpedia.org/data/Rome.json>; rel="alternate";
> > type="application/json"; title="Structured Descriptor Document (RDF/JSON
> > format)", <http://dbpedia.org/data/Rome.atom>; rel="alternate";
> > type="application/atom+xml"; title="OData (Atom+Feed format)", <
> > http://dbpedia.org/data/Rome.jsod>; rel="alternate";
> > type="application/odata+json"; title="OData (JSON format)", <
> > http://dbpedia.org/page/Rome>; rel="alternate"; type="text/html";
> > title="XHTML+RDFa", <http://dbpedia.org/resource/Rome>; rel="
> > http://xmlns.com/foaf/0.1/primaryTopic";, <http://dbpedia.org/resource/
> Rome>;
> > rev="describedby", <
> > http://mementoarchive.lanl.gov/dbpedia/timegate/http://
> dbpedia.org/data/Rome.xml>;
> > rel="timegate"
> > X-SPARQL-default-graph: http://dbpedia.org
> > Cache-Control: max-age=604800
> > Access-Control-Allow-Origin: *
> > Access-Control-Allow-Credentials: true
> > Access-Control-Allow-Methods: GET, POST, OPTIONS
> > Access-Control-Allow-Headers:
> > DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,
> If-Modified-Since,Cache-Control,Content-Type,Accept-Encoding
> > Accept-Ranges: bytes
> >
> > <?xml version="1.0" encoding="utf-8" ?>
> > <rdf:RDF
> > xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
> > ...
> >
> --
> Lorenz Bühmann
> AKSW group, University of Leipzig
> Group: http://aksw.org - semantic web research center
>
>
--
Jean-Marc Vanel
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