Thank you for the response, Andy. Unfortunately I can’t reproduce what you
describe here. I started Fuseki 5.1 with a config file using the config you
gave me here. I then used the Fuseki “add data” to upload a TriG file with the
data in your example. When I go to query the default graph, I don’t see any
matches for :x. If I do a
SELECT * WHERE { GRAPH ?g { :x rdf:type ?T }}
I only get
:x :graph1
Did you run your test different somehow?
A second question. I thought maybe the inference would appear after
re-starting Fuseki, but the data was erased. I would have thought that {
:tdbDataset a tdb:DatasetTDB } meant the data was saving in TDB, but it doesn’t
seem to be persistent. Why is that?
Thanks again for all your efforts
-- Scott
From: Andy Seaborne <[email protected]>
Sent: Thursday, September 12, 2024 6:10 AM
To: [email protected]
Subject: [EXTERNAL] Re: Using Fuseki to query the union of datasets - with
inference
CAUTION: This email originated from outside of the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe.
Hi Scott,
On 09/09/2024 21:28, Scott Henninger wrote:
> Thank you for the config for unionDefaultGraph, Andy. I am able to see the
> data both in the named graph and the default graph with your config. Now I
> want to add inference to the default graph. In that case I do need to go
> through a model, correct?
>
> Below is a config that I’m trying that doesn’t do what I want. I cannot see
> the triples in the default graph and no inferences are created. What am I
> doing wrong here? Specifically what would a config look like that performs
> inferences that appear in the default graph?
tdb:unionDefaultGraph only makes the SPARQL default graph appear as the
union of named graphs.
To get the inference code to see a union graph, try a named graph of
<urn:x-arq:UnionGraph>
The tdb:unionDefaultGraph can be removed unless you want to have
(non-inference) access to the dataset.
-----
:defaultDataset a ja:RDFDataset ;
ja:defaultGraph :infModel ;
.
:infModel a ja:InfModel ;
ja:baseModel :tdbGraph ;
ja:reasoner [
ja:reasonerURL
<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>>
;
] ;
.
:tdbGraph a tdb:GraphTDB ;
tdb:dataset :tdbDataset ;
tdb:namedGraph <urn:x-arq:UnionGraph> ## *******
.
:tdbDataset a tdb:DatasetTDB ;
tdb:location "DB" ;
.
-----
I tried (TriG):
-----------
GRAPH :graph1 {
:x rdf:type :T1 .
}
GRAPH :graph2 {
:T1 rdfs:subClassOf :T2 .
}
-----------
query:
SELECT * { :x rdf:type ?T }
and got T1 and T2.
> :service1 rdf:type fuseki:Service ;
> fuseki:name "union-graph-inference" ;
> fuseki:serviceQuery "sparql" ;
> fuseki:dataset : defaultDataset;
> .
> :defaultDataset a ja:RDFDataset ;
> ja:defaultGraph :infModel ;
> .
> :infModel a ja:InfModel ;
> ja:baseModel :tdbGraph ;
> ja:reasoner [
> ja:reasonerURL
> <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner><http://jena.hpl.hp.com/2003/OWLFBRuleReasoner<http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>>>
> ;
> ] ;
> .
> :tdbGraph a tdb:GraphTDB ;
> tdb:dataset :tdbDataset ;
> .
> :tdbDataset a tdb:DatasetTDB ;
NB This is TDB1.
It should not affect this query but TDB2 is a better choice long term.
Both work in the illustration above.
TDB2 is more robust and work better in Fuseki.
> tdb:location "DB" ;
> tdb:unionDefaultGraph true ;
> .
>
>
> Thanks for all your help
> -- Scott
>
> From: Andy Seaborne <[email protected]<mailto:[email protected]>>
> Sent: Saturday, August 24, 2024 9:52 AM
> To: [email protected]<mailto:[email protected]>
> Subject: Re: [EXTERNAL] Re: Using Fuseki to query the union of datasets
>
> CAUTION: This email originated from outside of the organization. Do not click
> links or open attachments unless you recognize the sender and know the
> content is safe.
>
>
>
> On 24/07/2024 20:08, Scott Henninger wrote:
>> Thank you for the response, Pedro. However it seems to me that I am already
>> applying the approach you reference in the page. See lines 35-37 int the
>> config file I included. Perhaps I am applying it wrong? If so, where am I
>> going wrong?
>
> You don't need to go through a model. Connect the fuseki:Service to the
> dataset with tdb:unionDefaultGraph
>
>
> :service1 rdf:type fuseki:Service ;
> fuseki:name "union-graph" ;
> fuseki:serviceQuery "sparql" ;
> fuseki:dataset :tdbDataset ;
>
> :tdbDataset rdf:type tdb:DatasetTDB ;
> tdb:location "DB" ;
> tdb:unionDefaultGraph true ;
> .
>
> Andy
>
>>
>> -- Scott
>>
>> From: Pedro
>> <[email protected]<mailto:[email protected]<mailto:[email protected]%3cmailto:[email protected]>>>
>> Sent: Tuesday, July 23, 2024 4:35 PM
>> To:
>> [email protected]<mailto:[email protected]<mailto:[email protected]%3cmailto:[email protected]>>
>> Subject: [EXTERNAL] Re: Using Fuseki to query the union of datasets
>>
>> CAUTION: This email originated from outside of the organization. Do not
>> click links or open attachments unless you recognize the sender and know the
>> content is safe.
>>
>> Hi Scott
>>
>> Look at the TDB and TDB2 examples in
>> https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html<https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html><https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html<https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html>><https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html<https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html><https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html<https://jena.apache.org/documentation/fuseki2/fuseki-configuration.html>>>
>>
>> Uncomment the line
>>
>> tdb:unionDefaultGraph true;
>>
>> Cheers!
>>
>> On Tue, 23 Jul 2024, 22:29 Scott Henninger,
>> <[email protected]<mailto:[email protected]<mailto:[email protected]%3cmailto:[email protected]<mailto:[email protected]%3cmailto:[email protected]%3cmailto:[email protected]%3cmailto:[email protected]>>>>
>> wrote:
>>
>>> I am attempting to use Fuseki to query the union of a set of datasets. I
>>> am using the following configuration to define a TDB dataset named
>>> "union-graph" and setting tdb:unionDefaultGraph to true to query the union
>>> of the datasets. However when I query "union-graph" I do not see the
>>> triples from the datasets I have populated. How can I configure Fuseki to
>>> query the union of datasets?
>>>
>>> Thank you
>>> -- Scott
>>>
>>> @prefix : <#> .
>>> @prefix fuseki:
>>> <http://jena.apache.org/fuseki#<http://jena.apache.org/fuseki#><http://jena.apache.org/fuseki#<http://jena.apache.org/fuseki#>><http://jena.apache.org/fuseki#<http://jena.apache.org/fuseki#><http://jena.apache.org/fuseki#<http://jena.apache.org/fuseki#>>>>
>>> .
>>> @prefix rdf:
>>> <http://www.w3.org/1999/02/22-rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#><http://www.w3.org/1999/02/22-rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>><http://www.w3.org/1999/02/22-rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#><http://www.w3.org/1999/02/22-rdf-syntax-ns#<http://www.w3.org/1999/02/22-rdf-syntax-ns#>>>>
>>> .
>>>
>>> @prefix rdfs:
>>> <http://www.w3.org/2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#><http://www.w3.org/2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>><http://www.w3.org/2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#><http://www.w3.org/2000/01/rdf-schema#<http://www.w3.org/2000/01/rdf-schema#>>>>
>>> .
>>> @prefix tdb:
>>> <http://jena.hpl.hp.com/2008/tdb#<http://jena.hpl.hp.com/2008/tdb#><http://jena.hpl.hp.com/2008/tdb#<http://jena.hpl.hp.com/2008/tdb#>><http://jena.hpl.hp.com/2008/tdb#<http://jena.hpl.hp.com/2008/tdb#><http://jena.hpl.hp.com/2008/tdb#<http://jena.hpl.hp.com/2008/tdb#>>>>
>>> .
>>> @prefix ja:
>>> <http://jena.hpl.hp.com/2005/11/Assembler#<http://jena.hpl.hp.com/2005/11/Assembler#><http://jena.hpl.hp.com/2005/11/Assembler#<http://jena.hpl.hp.com/2005/11/Assembler#>><http://jena.hpl.hp.com/2005/11/Assembler#<http://jena.hpl.hp.com/2005/11/Assembler#><http://jena.hpl.hp.com/2005/11/Assembler#<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" .
>>>
>>> # TDB
>>> tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset .
>>> tdb:GraphTDB rdfs:subClassOf ja:Model .
>>>
>>> :service1 rdf:type fuseki:Service ;
>>> fuseki:name "union-graph" ;
>>> fuseki:serviceQuery "sparql" ;
>>> fuseki:dataset :dataset ;
>>> .
>>>
>>> :dataset rdf:type ja:RDFDataset ;
>>> ja:defaultGraph :model_default ;
>>> .
>>>
>>> :model_default a ja:InfModel ;
>>> ja:baseModel :tdbGraph ;
>>> .
>>>
>>> :tdbDataset rdf:type tdb:DatasetTDB ;
>>> tdb:location "DB" ;
>>> tdb:unionDefaultGraph true ;
>>> .
>>>
>>> :tdbGraph rdf:type tdb:GraphTDB ;
>>> tdb:dataset :tdbDataset ;
>>> .
>>>
>>>
