Dear all, I'm using the Virtuoso Jena Provider with Virtuoso 06.00.3123 but I'm getting an exception when serialising the Jena Model (Jena 2.5.7) I get from a describe SPARQL query.
The source code is: ByteArrayOutputStream out = new ByteArrayOutputStream(); VirtuosoQueryExecution qexec = VirtuosoQueryExecutionFactory.create(queryString, graph); Model results = qexec.execDescribe(); results.write(out, "RDF/XML-ABBREV"); An the query: DESCRIBE ?r FROM <http://rhizomik.net> WHERE { ?r <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://purl.org/rss/1.0/item> .} The exception is: com.hp.hpl.jena.shared.BadURIException: Only well-formed absolute URIrefs can be included in RDF/XML output: <The first version of Rhizomer, version 0.1, is announced at the EKAW'08 conference.> Code: 58/REQUIRED_COMPONENT_MISSING in SCHEME: A component that is required by the scheme is missing. However, if I perform the same query through the Virtuoso SPARQL endpoint I get the following triples: <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://purl.org/dc/elements/1.1/date> "2008-10-03" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/2002/12/cal/icaltzd#dtend> "2008-10-03" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://purl.org/rss/1.0/description> "The first version of Rhizomer, version 0.1, is announced at the EKAW'08 conference." . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://purl.org/rss/1.0/title> "Rhizomer 0.1 is announced at EKAW'08" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/2003/01/geo/wgs84_pos#lat> "37.563855" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/2003/01/geo/wgs84_pos#long> "15.161365" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/2002/12/cal/icaltzd#dtstart> "2008-10-03" . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://purl.org/rss/1.0/link> "http://localhost:8080/rhizomer/html/blog/2008/10/03/announced-rhizomer-0.1/"; . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://purl.org/dc/elements/1.1/creator> <http://purl.org/dc/elements/1.1/creator> . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/2000/01/rdf-schema#label> "Announced Rhizomer 0.1" . It seems that the query result is not correctly serialised into the Jena Model and a literal is modelled using a resource Jena object. Is this a bug or am I doing something wrong? In fact, there is strange triple in the NTriples serialisation: <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> . that is not present in N3/Turtle one: @prefix ns1: <http://purl.org/rss/1.0/> . <http://localhost:8080/rhizomer/blog/2008/10/03/announced-rhizomer-0.1/> rdf:type ns1:item . Best, Roberto García http://rhizomik.net/~roberto/
