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$ErrorHandler
Std.fatal(ErrorHandlerFactory.java:136)
at
org.apache.jena.riot.lang.LangEngine.raiseException(LangEngi
ne.java:165)
at org.apache.jena.riot.lang.LangEngine.nextToken(LangEngine.ja
va:108)
at
org.apache.jena.riot.lang.LangTurtleBase.triples(LangTurtleB
ase.java:248)
at
org.apache.jena.riot.lang.LangTurtleBase.triplesSameSubject(
LangTurtleBase.java:190)
at
org.apache.jena.riot.lang.LangTurtle.oneTopLevelElement(Lang
Turtle.java:46)
at
org.apache.jena.riot.lang.LangTurtleBase.runParser(LangTurtl
eBase.java:89)
at org.apache.jena.riot.lang.LangBase.parse(LangBase.java:42)
at
org.apache.jena.riot.RDFParserRegistry$ReaderRIOTLang.read(R
DFParserRegistry.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="licens
e",<
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://dbped
ia.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
