Re: Fuseki with inference and TDB using LUBM test data

Özgür EROĞLU Wed, 16 Oct 2013 05:38:51 -0700

Hi,

Yes, when I run queries that does not require inference, I get results.

I think my problem is related to your second question. How can I loadthe ontology into TDB? I load the generated lubm data with s-put, shouldI merge data and ontology before loading? At some of the configurationsI have seen on web, there was a line which was smt. like "ja:scheme<#sch>" in the fuseki inf-model section of the configuration. Is thatrelated?


SELECT *
{?X rdf:type ub:ResearchGroup .
 ?X ub:subOrganizationOf* <http://www.University0.edu>}

returns nothing, but

SELECT *
{ ub:subOrganizationOf ?p ?o }

returns

----------------------------------------------------------------------------------------------------------
| p                                                    | o                      
                         |
==========================================================================================================
| rdf:type                                             | rdf:Property           
                         |
| rdf:type                                             | 
<http://www.w3.org/2000/01/rdf-schema#Resource> |
| <http://www.w3.org/2000/01/rdf-schema#subPropertyOf> | ub:subOrganizationOf   
                         |
----------------------------------------------------------------------------------------------------------



Özgür Eroğlu


On 10/16/2013 03:08 PM, Andy Seaborne wrote:

Hi there,

When you run a query that does not require inferenc, do you get anyresults?


Is the ontology loaded into the TDB store?

Does this query return anything:

SELECT *
{?X rdf:type ub:ResearchGroup .
 ?X ub:subOrganizationOf* <http://www.University0.edu>}

and this one:

SELECT *
{ ub:subOrganizationOf ?p ?o }

    Andy



On 15/10/13 20:05, Özgür EROĞLU wrote:

Hi all,

I am trying to configure Fuseki with inference and TDB and using a LUBM
generated data for testing. I have searched for similar configurations
(one of which is here) and read the documentation for Fuseki
configuration .

Following is my Fuseki configuration :

#------------------------------------------------------------------------------------------------------


# Licensed under the terms of http://www.apache.org/licenses/LICENSE-2.0

@prefix :        <#> .
@prefix fuseki:  <http://jena.apache.org/fuseki#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

@prefix rdfs:   <http://www.w3.org/2000/01/rdf-schema#> .
@prefix tdb:     <http://jena.hpl.hp.com/2008/tdb#> .
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> .

[] rdf:type fuseki:Server ;
     fuseki:services (
      <#service1>
) .

# Custom code.
[] ja:loadClass "com.hp.hpl.jena.tdb.TDB" .LUBM


# TDB
tdb:DatasetTDB  rdfs:subClassOf  ja:RDFDataset .
tdb:GraphTDB    rdfs:subClassOf  ja:Model .

## ---------------------------------------------------------------
## Service with only SPARQL query on an inference model.
## Inference model bbase data in TDB.

<#service1>  rdf:type fuseki:Service ;
     fuseki:name              "ds" ;             # http://host/inf
     fuseki:serviceQuery      "sparql" ;          # SPARQL query service
     fuseki:serviceUpdate     "update" ;
     fuseki:serviceQuery                "query" ;
     fuseki:serviceUpload               "upload" ;
     fuseki:serviceReadWriteGraphStore  "data" ;
     fuseki:serviceReadGraphStore       "get" ;
     fuseki:dataset           <#dataset> ;
     .

<#dataset> rdf:type       ja:RDFDataset ;
     ja:defaultGraph       <#model_inf> ;
     .

<#model_inf> a ja:InfModel ;
     ja:baseModel <#tdbGraph> ;
     ja:reasoner [

ja:reasonerURL<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>;

     ]
  .

<#tdbDataset> rdf:type tdb:DatasetTDB ;
     tdb:location "/tdb/" ;
    .

<#tdbGraph> rdf:type tdb:GraphTDB ;
     tdb:dataset <#tdbDataset>
    .

#------------------------------------------------------------------------------------------------------



I load a dataset which was generated with LUBM data generator. The
generator is UBA1.7 and the ontology is an owl file named Univ-Bench.
My problem here is that when I run a sparql query that requires
inference, I get no result. For example, although the data includes
triples like

#------------------------------------------------------------------------------------------------------


<http://www.Department14.University0.edu/ResearchGroup0>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#ResearchGroup> .
<http://www.Department14.University0.edu/ResearchGroup0>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf>
<http://www.Department14.University0.edu> .
<http://www.Department14.University0.edu>
<http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#subOrganizationOf>
<http://www.University0.edu> .

#------------------------------------------------------------------------------------------------------



when I run the following sparql query, I get no result(empty resultset).

#------------------------------------------------------------------------------------------------------


PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX ub: <http://www.lehigh.edu/~zhp2/2004/0401/univ-bench.owl#>
SELECT ?X
WHERE
{?X rdf:type ub:ResearchGroup .
?X ub:subOrganizationOf <http://www.University0.edu>}

#------------------------------------------------------------------------------------------------------



I think Fuseki somehow should know about the ontology (univ-bench). Also
I am not sure whether my Fuseki configuration is ok or not for inference
(e.g. if my reasoner is the right one).

Could someone explain what I am missing here and why I could not get
correct results?


Regards,

Özgür Eroğlu

Re: Fuseki with inference and TDB using LUBM test data

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