Re: [dotNetRDF-Support] Issue between dotnetrdf and Fuseki Server with Reasoner

[Rob V. <rv...@do...>]

Diogo

First off please do not email developers directly, if you have further
questions please subscribe to the support mailing list at
https://lists.sourceforge.net/lists/listinfo/dotnetrdf-support and send
questions to dot...@li...
This allows all the project contributors opportunity to help (and shares
the load of helping) as well as letting future users benefit from your
questions.

Without seeing your code/data it is hard to tell what is going on.  It may
be that you are trying to retrieve the wrong graph or retrieving a graph
that genuinely is empty.

Your Fuseki configuration file is slightly strange in that the TDB
reasoning service is backed by a different TDB dataset then your
non-reasoning service.  Was this actually intentional?  And are you sure
you actually put data in the given TDB databases?

It is possibly that the reasoning service returns an empty graph because
the actual TDB database behind it is empty

You can run Fuseki against a specific location without needing a
configuration file like so:

java -jar fuseki-server.jar --loc /path/to/db /ds

You can then try the following query to verify whether the database
actually contains any data:

SELECT * WHERE { { ?s ?p ?o } UNION { GRAPH ?g { ?s ?p ?o } } }

This will let you test each specified location to see if it actually has
any data in it to start with.

Unfortunately without further details I cannot help you any further,

Best Regards,

Rob



On 31/05/2014 18:29, "Diogo Martinho" <dio...@gm...> wrote:

>Dear Mr. Vesse
>I am a student in Instituto Superior de Engenharia do Porto, Portugal,
>and I am currently developing a C# web application for a school
>project of that takes advantage of both Ontologies and Web Semantics.
>In my project  I am using a ".owl" ontology, which I have created in
>Protege and I used Fuseki Server to upload the same ontology.
>I needed an API that would allow me to load the information from my
>ontology in my website and I found the dotnetrdf API.
>I followed the tutorial and the information you have provided in your
>website and I was able to load my ontolgy graph however I am only able
>to do so if it is not configured with a reasoner mechanism.
>I will need to use a reasoner mechanism that I have configured in my
>config.ttl (sent in the attachment), and everytime I call the
>LoadGraph() function, the resulting graph always returns empty for
>some unknown reason.
>I have no idea why this problem is happening and that is why I am
>sending you this message in great hope that you will be able to help
>me solve this issue.
>I thank in advance for any further answers from you and I will be
>looking forward for a response.
>Thank you very much,
>Diogo Martinho.