Re: [Bigdata-developers] Inferencing from Blazegraph Workbench

[Bryan T. <br...@bl...>]

Bob,

You need to create a namespace in which inference is enabled.  You can do
this using the workbench.  Or you can do this using the REST API.  See
https://wiki.blazegraph.com/wiki/index.php/InferenceAndTruthMaintenance.
Especially look at
https://wiki.blazegraph.com/wiki/index.php/InferenceAndTruthMaintenance#Triples_Modes
(properties required) and
https://wiki.blazegraph.com/wiki/index.php/Quick_Start#Create_Namespace
(workbench). See
https://wiki.blazegraph.com/wiki/index.php/REST_API#Triples_.2B_Inference_.2B_Truth_Maintenance
for doing this with the REST API.

Thanks,
Bryan

On Sat, May 7, 2016 at 12:11 PM, Bob DuCharme <bo...@sn...> wrote:

> I want to have SPARQL queries on http://192.168.0.79:9999/blazegraph
> return inferred triples, so that after loading the data at
> http://learningsparql.com/2ndeditionexamples/ex417.ttl I can query for
> dc:creator values and see the dm:composer and dm:photographer values
> returned. I was able to do a query on dm:photographer with no problem,
> but couldn 't get at any inferred triples.
>
> Based on what I saw at
>
> https://wiki.blazegraph.com/wiki/index.php/SPARQL_Update#Manage_truth_maintenance_in_SPARQL_UPDATE
> ,
> on http://192.168.0.79:9999/blazegraph/#update I entered ENABLE
> ENTAILMENTS with a Type of "SPARQL Update" selected underneath. This
> gave me a bunch of errors starting with this:
>
> java.util.concurrent.ExecutionException:
> java.util.concurrent.ExecutionException:
> org.openrdf.query.UpdateExecutionException: java.lang.RuntimeException:
> java.util.concurrent.ExecutionException:
> java.lang.ArrayIndexOutOfBoundsException: 3
>
> I had hoped that ENABLE (or CREATE) ENTAILMENTS as an update request
> would let me query for the dc:creator values. Is this possible? What am
> I doing wrong?
>
> Thanks,
>
> Bob
>
>
>
>
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