Hi Marco,
Apologies, I seem to have missed the update from development indicating this
issue has been resolved. You indicated having a local DBpedia instance in which
case you will need to rebuild and update your installation with the latest
snapshot containing this fix which can be downloaded from:
ftp://download.openlinksw.com/support/vos/virtuoso-opensource-6-20100706.tar.gz
Please let me know if this works for you ...
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 8 Jul 2010, at 13:00, Marco FOSSATI wrote:
> Hi Hugh and everyone,
>
> I was wondering if you have any news about that "Tag not defined" error.
> Best regards,
>
> Marco FOSSATI
> Research and Development Engineer
> Arisem a Thales company
> 1-5, Avenue Carnot
> 91883 Massy Cedex
> Tél. : +33 01 69 75 30 24
> Fax : +33 01 69 75 31 56
> www.arisem.com
>
>
> Hugh Williams wrote:
>>
>> Hi Marco,
>>
>> We have been able to recreate this "tag not defined" error you report
>> running that DBpedia query against the Jena provider and development are
>> working on fixing it. I shall let you know when a fix is available ...
>>
>> 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 25 May 2010, at 10:18, Marco FOSSATI wrote:
>>
>>> Hello Hugh and everyone,
>>>
>>> You can find the answers to your questions below.
>>> I've already tried to use the HTTP Client Java API from Apache to
>>> communicate with Virtuoso (with a POST method): all the queries seem here
>>> to work perfectly, including the "cursed" one.
>>> When I got on the Virtuoso Jena Provider, I've realized that the same job
>>> could be done with 3 lines of code.
>>> The choice actually depends on the reliability of the API.
>>>
>>> Best regards,
>>>
>>> Marco FOSSATI
>>> Research and Development Engineer
>>> Arisem a Thales company
>>> 1-5, Avenue Carnot
>>> 91883 Massy Cedex
>>> Tél. : +33 01 69 75 30 24
>>> Fax : +33 01 69 75 31 56
>>> www.arisem.com
>>>
>>>
>>> Hugh Williams wrote:
>>>>
>>>> Hi Marco,
>>>>
>>>> I have tested the query you report against a local DBpedia 3.5.1 Instance
>>>> we have in-house via the Virtuoso Jena Provider and it runs fine for me.
>>>> It is specifically the addition of the order by in the query that results
>>>> in the problem on your machine ?
>>> Yes, I've tried to run the query without the ORDER BY clause and it works
>>> fine.
>>> I' ve also found that the problem deals with the foaf:name property and NOT
>>> with the rdfs:label one.
>>> For example, this query WORKS:
>>> SELECT ?test WHERE { <http://dbpedia.org/resource/Unreal_II:_The_Awakening>
>>> <http://www.w3.org/2000/01/rdf-schema#label> ?test } ORDER BY ?test
>>>
>>> This query DOESN'T:
>>> SELECT ?test WHERE { <http://dbpedia.org/resource/Unreal_II:_The_Awakening>
>>> <http://xmlns.com/foaf/0.1/name> ?test } ORDER BY ?test
>>>
>>> N.B.: All the queries WORK if launched from the SPARQL endpoint, but not
>>> via Java.
>>>>
>>>> What Virtuoso release are you running as I have seen the "Tag 20 not
>>>> defined" error with earlier v5 builds from about a year ago but that issue
>>>> has long since been resolved and does not occur with the components
>>>> shipped with the latest v6 product or those from the VOSDownload page link
>>>> you refer to below. If you have been using multiple Virtuoso versions
>>>> please ensure their is only the one virt_jena and virtjdbc3 jar files on
>>>> the system and that you are not picking up an old version.
>>> I'm running the Virtuoso Open Source Edition (multi threaded), Version
>>> 6.1.1.3127, Build Apr 4 2010, Compiled for Linux (x86_64-pc-linux-gnu), on
>>> a Debian Lenny distro.
>>> I firstly downloaded the sources tarball from the web, but I encountered
>>> problems when trying to compile them; I found then a Debian package in the
>>> Sid repository and easily installed it.
>>>>
>>>> The Virtuoso open source and commercial products use the same Virtuoso
>>>> Jena Provider, thus the link you used below does give you the official
>>>> commercial provider. Their are no Maven repositories for it, the source
>>>> are available in the open source archive (~/binsrc/jena) , should you want
>>>> to access them ...
>>>>
>>>> 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 May 2010, at 10:24, Marco FOSSATI wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I'm working with the Virtuoso Jena Driver API to query a local DBpedia
>>>>> ontology and process information with Jena API.
>>>>> When launching a query with an ORDER BY clause, the following exception
>>>>> is thrown:
>>>>>
>>>>> Exception in thread "main" com.hp.hpl.jena.shared.JenaException: Can not
>>>>> create ResultSet.:virtuoso.jdbc3.VirtuosoException: Tag 20 not defined.
>>>>>
>>>>> Here an example of SPARQL query that won't work:
>>>>>
>>>>> SELECT ?title
>>>>> WHERE { { <http://dbpedia.org/resource/Unreal_II:_The_Awakening>
>>>>> <http://xmlns.com/foaf/0.1/name> ?title } UNION {
>>>>> <http://dbpedia.org/resource/Unreal_II:_The_Awakening>
>>>>> <http://www.w3.org/2000/01/rdf-schema#label> ?title } }
>>>>> ORDER BY ?title
>>>>>
>>>>> I found the virt_jena and virtjdbc3 jars in the OpenSource Virtuoso Wiki
>>>>> (here).
>>>>> As I'd like to use them in my application, I'm wondering if there is an
>>>>> official release of this API, if it is maintained and if there is any
>>>>> Maven 2 artifact set.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> Marco FOSSATI
>>>>> Research and Development Engineer
>>>>> Arisem a Thales company
>>>>> 1-5, Avenue Carnot
>>>>> 91883 Massy Cedex
>>>>> Tél. : +33 01 69 75 30 24
>>>>> Fax : +33 01 69 75 31 56
>>>>> www.arisem.com
>>>>> ------------------------------------------------------------------------------
>>>>>
>>>>> _______________________________________________
>>>>> Virtuoso-devel mailing list
>>>>> [email protected]
>>>>> https://lists.sourceforge.net/lists/listinfo/virtuoso-devel
>>>>
>>> ------------------------------------------------------------------------------
>>>
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>>
