Hi Hugh, Thanks for your response.
> Note, there is a later Virtuoso snapshot build available from the following > FTP server location: > > > ftp://download.openlinksw.com/support/vos/virtuoso-opensource-6-20110308.tar.gz I have installed and tested it. > The Virtuoso SPARQL endpoint does provide and option to serialize results as > RDF/XML that you could trying using, see: > > > http://docs.openlinksw.com/virtuoso/rdfsparql.html#rdfsparqlprotocolendpoint Yes, I've been able to dump a proper version of the graph using this. However, the dump_one_graph method continues generating invalid blank nodes. > To use the virtjdbc4.jar, simply include it in your classpath rather then > using the virtjdbc3.jar, when compiling and running the program ... It complains about jdbc3 classes and packages. As I see in the Jena connector source code, it is linked against JDBC3 classes so I assume that it shouldn't work with JDBC4. Or is there another implementation of the Jena connector using JDBC4? I've been unable to find it in the 20110308 package. Finally, I continue experiencing many mysterious "Tag NNN" exceptions and other more specific like: java.lang.Error: java.lang.ClassCastException:java.lang.Short cannot be cast to openlink.util.Vector virtuoso.jdbc3.VirtuosoConnection.read_request(Unknown Source) virtuoso.jdbc3.VirtuosoFuture.nextResult(Unknown Source) virtuoso.jdbc3.VirtuosoStatement.close(Unknown Source) virtuoso.jena.driver.VirtuosoQueryExecution.close(Unknown Source) net.rhizomik.rhizomer.store.virtuoso.VirtuosoStore.query(VirtuosoStore.java:185) I'm using ARQ 2.8.7 and also teste ARQ 2.8.6. Should I use an older version of Jena ARQ or this is due to another problem? Best, Roberto
