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Re: SPARQL Endpoint with Inference support

From: Matt Perry <msperry@gmail.com>
Date: Mon, 27 Sep 2010 10:46:06 -0400
Message-ID: <AANLkTim+zOk=eZfXXa2y_cDn0ZX6FYeXmAFX4HgjvK82@mail.gmail.com>
To: Riccardo Tasso <tasso@elet.polimi.it>
Cc: "semantic-web@w3.org" <semantic-web@w3.org>
Hi,

You could also use Oracle Semantic Technologies.
http://www.oracle.com/technetwork/database/options/semantic-tech/index.html

Oracle provides a triple store with extensive query and inference
support. Any subset of RDFS/OWL reasoning up to OWL2 RL is fully
supported and can be turned on and off a query time. Oracle provides a
SQL query interface and full SPARQL query and protocol support through
Jena/Joseki or Sesame (adapters are provided to use Oracle as a
backend for both Jena and Sesame).

You can find more information at the above link.

Thanks,
Matt

On Mon, Sep 27, 2010 at 10:19 AM, Andrea Splendiani
<andrea.splendiani@bbsrc.ac.uk> wrote:
> Yes, you can do that.
> For updates, it may be more tricky.
>
> In brief:
>
> In Jena/Joseki you build up a model via a spec file.
>
> Imagine your data files (the triplestore, not the rdf) are at
> /exampled/dir/data,
>
> you can build both a plain model which holds /example/dir/data or an an
> infmodel, which has the same data and your choice of reasoners.
>
> You can plug any of the two into Joseki (mutiple instances on different
> ports)
>
> Now:
>
> if you use TDB as a Jena backend, I'm not sure it is safe versus concurrent
> accesses (the two joseki accessing the same files). Not for sure in writing,
> perhaps ok in reading.
>
> You can use SDB (which is a relational backed triplestore): less performant,
> but should support concurrent R/W access.
>
> You can find more info on the Jena mailing list. If you check the archieves,
> I recall some message about TDB/SDB and concurrency.
>
> How big is your data ?
>
> SDB il less performant than TDB, for big data (well... relatively) this can
> make a difference.
>
> ciao,
> Andrea
>
> Il giorno 27/set/2010, alle ore 16.09, Riccardo Tasso ha scritto:
>
>> Grazie Andrea,
>>     but what if I need to access data from a SPARQL endpoint? Could I
>> use Joseki to query two different models (one inferred, and one
>> "simple") such that they are based on the same data? Please note that
>> I'd like to have the possibility to execute updates too.
>>
>> Cheers,
>>     Riccardo
>>
>> On 27/09/2010 15:19, Andrea Splendiani wrote:
>>> Hi,
>>>
>>> you can also use Jena for this.
>>> You have a choice of reasoners which you can attach to the RDF model, in
>>> your case you can use either a minimal "transitive reasoner" and (bits
> of) a
>>> rule based reasoner. You can select which rules you want to apply, or
> choose
>>> among default configurations.
>>> If you define your own rules, use backward rules.
>>>
>>> at the SPARQL level, this is completely transparent. But you can change
>>> reasoners dynamically programmatically if you need.
>>>
>>> ciao,
>>> Andrea
>>>
>>> Il giorno 22/set/2010, alle ore 12.06, Riccardo Tasso ha scritto:
>>>
>>>
>>>> I'm interested in executing SPARQL queries over an endpoint, sometimes
>>>> with reasoning, sometimes without (dynamically). The reasoning task I
>>>> need are RDFS plus owl:sameAs. It is also an interesting question to me,
>>>> wheter a SPARQL query could specify if the results should contain
>>>> inferred triples or not.
>>>>
>>>> Do you know a triple store, possibly supporting named graphs, suitable
>>>> to my needs?
>>>>
>>>> Thanks,
>>>>     Riccardo
>>>>
>>>>
>>>>
>>> Andrea Splendiani
>>> Senior Bioinformatics Scientist
>>> Centre for Mathematical and Computational Biology
>>> +44(0)1582 763133 ext 2004
>>> andrea.splendiani@bbsrc.ac.uk
>>>
>>>
>>>
>>>
>>
>
> Andrea Splendiani
> Senior Bioinformatics Scientist
> Centre for Mathematical and Computational Biology
> +44(0)1582 763133 ext 2004
> andrea.splendiani@bbsrc.ac.uk
>
>
>
>
>
Received on Monday, 27 September 2010 17:42:54 GMT

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