Re: [Bigdata-developers] Inferencing from Blazegraph Workbench

[Bob D. <bo...@sn...>]

Thanks Bryan, that worked!

Watch my blog at snee.com/bobdc.blog for a writeup within a few weeks.

Bob


On 05/07/2016 01:10 PM, Bryan Thompson wrote:
> 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... 
> <mailto: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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