Re: OWL Inferencing on TDB database in Fuseki

[Andy Seaborne]

On 10/12/13 17:41, Jeanette Samuelsen wrote:

Hello,

I have tried to make a configuration file for Fuseki to make OWL
inferencing work with a TDB database. Thus far I have been able to do
inferencing on an empty dataset, to connect to the TDB database and do
queries, but not both.

This is the error I'm currently getting:
"com.hp.hpl.jena.assembler.exceptions.AmbiguousSpecificTypeException:
cannot find a most specific type for
file:///home/path/jena/jena-fuseki-1.0.0/test.ttl#dataset2, which has as
possibilities: ja:Model tdb:DatasetTDB."

I tried fixing the error by doing tdb:DatasetTDB rdfs:subClassOf ja:Model ,
but this was not possible.

Below is my configuration file.

At
[[
<#model2> rdf:type ja:InfModel;
      ja:baseModel <#dataset2>
]]
it needs a model(=graph) not a dataset (a collection of graphs).

See
http://jena.apache.org/documentation/tdb/assembler.html#graph

You need something like (untested):

<#dataset2> rdf:type tdb:DatasetTDB ;
    tdb:location "DB" ;

<#graph2> rdf:type tdb:GraphTDB ;
    tdb:dataset <#dataset2> .

<#model2> rdf:type ja:InfModel;
      ja:baseModel <#graph2>
....

Note ja:baseModel -> <#graph2> of type tdb:GraphTDB

Any help would be greatly appreciated.

Best regards,
Jeanette

@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#> .
@prefix sdb:     <http://jena.hpl.hp.com/2007/sdb#> .

[] rdf:type fuseki:Server ;

fuseki:services ( <#tdb> ) .

<#tdb> rdf:type fuseki:Service ;
     fuseki:name "tdb" ;
     fuseki:serviceQuery "sparql" ;
     fuseki:serviceUpdate "update" ;
     fuseki:dataset <#model2> ;
.

#select which set to . #use
[] ja:loadClass "com.hp.hpl.jena.tdb.TDB" .
     tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset .
     tdb:GraphTDB rdfs:subClassOf ja:Model .

<#dataset2>
         rdf:type tdb:DatasetTDB;
         tdb:location "/home/path/tdb/sports" ;
         tdb:unionDefaultGraph true ;
.

<#model2> rdf:type ja:InfModel;
     ja:baseModel <#dataset2>;
     ja:reasoner
       [ ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>;
         ja:schema <#interpretationSchema>
       ] .
         #<#tdbGraph> rdf:type tdb:GraphTDB; tdb:location "DB"; .
     <#interpretationSchema> a ja:MemoryModel ;
         ja:content [ ja:externalContent <file:/home/path/running.n3> ;
     ]
    .