Scott,
In looking at improving this area, could you give some background:
1/ What level of inference is the data going to use?
2/ Does the schema/ontology need to be in the dataset and visible to
runtime query? Or in a separate file?
3/ Does the schema/ontology change incrementally or is it changing to a
"new released version", infrequently and with significant changes?
Andy
On 12/09/2024 20:51, Scott Henninger wrote:
I had a typo. The results I get are:
:T1 :graph1
-- Scott
From: Scott Henninger
Sent: Thursday, September 12, 2024 2:29 PM
To: users@jena.apache.org
Subject: Re: Using Fuseki to query the union of datasets - with inference
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 <a...@apache.org<mailto:a...@apache.org>>
Sent: Thursday, September 12, 2024 6:10 AM
To: users@jena.apache.org<mailto:users@jena.apache.org>
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
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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 <a...@apache.org<mailto:a...@apache.org>>
Sent: Saturday, August 24, 2024 9:52 AM
To: users@jena.apache.org<mailto:users@jena.apache.org>
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
<pedro.win.s...@googlemail.com.INVALID<mailto:pedro.win.s...@googlemail.com.INVALID<mailto:pedro.win.s...@googlemail.com.INVALID%3cmailto:pedro.win.s...@googlemail.com.INVALID>>>
Sent: Tuesday, July 23, 2024 4:35 PM
To:
users@jena.apache.org<mailto:users@jena.apache.org<mailto:users@jena.apache.org%3cmailto:users@jena.apache.org>>
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
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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,
<scott.hennin...@ecstech.com<mailto:scott.hennin...@ecstech.com<mailto:scott.hennin...@ecstech.com%3cmailto:scott.hennin...@ecstech.com<mailto:scott.hennin...@ecstech.com%3cmailto:scott.hennin...@ecstech.com%3cmailto:scott.hennin...@ecstech.com%3cmailto:scott.hennin...@ecstech.com>>>>
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 ;
.
