Re: [Virtuoso-users] Problems dumping bnodes and loading complex ontology
Roberto, On 30 Mar 2011, at 15:24, Roberto García wrote: > 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. [Hugh] I presume you would have seen the official 6.1.3 archive is now available for download from source forge. > >> 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. [Hugh] So you are encountering this issue using the dump graphs method detailed at: http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VirtDumpLoadRdfGraphs If so, can you provide some sample data we can load to recreate this ? > >> 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? [Hugh] My mistake the Jena provider is bound to the virtjdbc3 driver, we are planning to update it to use the virtjdbc4 driver. I have corrected the documentation which implied it could be used with the virtjdbc4 driver also. Do do you have a test program we can compile locally to recreate this issue as the virtjdbc3 driver should work (simply updating to use virtjdbc4 is not likely to resolve it). It seems there is a problem returning the data in the result set ? Regards Hugh > > Best, > > Roberto > > -- > Create and publish websites with WebMatrix > Use the most popular FREE web apps or write code yourself; > WebMatrix provides all the features you need to develop and > publish your website. http://p.sf.net/sfu/ms-webmatrix-sf > ___ > Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users
Re: [Virtuoso-users] Problems dumping bnodes and loading complex ontology
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
Re: [Virtuoso-users] Problems dumping bnodes and loading complex ontology
Hi Roberto, 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 would recommend you upgrade to this version and retry if not already running this. 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 To use the virtjdbc4.jar, simply include it in your classpath rather then using the virtjdbc3.jar, when compiling and running the program ... Best Regards Hugh Williams Professional Services OpenLink Software Web: http://www.openlinksw.com Support: http://support.openlinksw.com Forums: http://boards.openlinksw.com/support Twitter: http://twitter.com/OpenLink On 24 Mar 2011, at 13:37, Roberto García wrote: > Dear all, > > I'm experiencing problems when serialising graphs managed by the > latest available version of Opensource Virtuoso. The graph contains > many blank nodes and when a take a look at the serialisation produced > by dump_one_graph I see triples like: > > <>rdf:typeowl:Class . > <>rdf:typeowl:Restriction . > > Is it possible to dump a graph using another serialisation like > RDF/XML in order to overcome this? > > I don't know if this is a related issue with the strange behaviour I'm > experiencing when loading a complex OWL ontology [1] into a "schema" > graph used for reasoning. When I do that and query the base graph > (using define input:inference the previous schema graph) I get > different kinds of exceptions referring to error Tag 0, Tag 248, etc. > > I'm sending this SPARQL queries to Virtuoso through the Jena connector > available at [2] and ARQ 2.8.6. By the way, how can I make it work > with virtjdbc4.jar instead of virtjdbc3.jar? > > Best, > > Roberto García > http://rhizomik.net/~roberto > > [1] http://rhizomik.net/ontologies/2009/09/copyrightonto.owl > [2] http://ods.openlinksw.com/dataspace/dav/wiki/Main/VOSDownload > > -- > Enable your software for Intel(R) Active Management Technology to meet the > growing manageability and security demands of your customers. Businesses > are taking advantage of Intel(R) vPro (TM) technology - will your software > be a part of the solution? Download the Intel(R) Manageability Checker > today! http://p.sf.net/sfu/intel-dev2devmar > ___ > Virtuoso-users mailing list > Virtuoso-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/virtuoso-users
