On 20/10/16 11:09, Mahmood Ahmad wrote:
Thanks Lorenz, Rob and Andy.
You kindly answered my next question for the namespace of the graph, where to
define it. I used Andy's safer query to specify the GRAPH as follows:
prefix owl: <http://www.w3.org/2002/07/owl#>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?class ?label ?description
WHERE {
GRAPH <http://myxyz.com/folder1/exampleulo> {
In your results below, the graph name is
<http://localhost:3030/ds/data/exmpttl>
Andy
?class a owl:Class.
OPTIONAL { ?class rdfs:label ?label}
OPTIONAL { ?class rdfs:comment ?description} }
}
This does not work either. There is definitely something wrong that I am doing.
Is this to do with how we configure Fuseki?
Regards
Lorenz, to your question, I am pasting the JSON output for query results for
the query
SELECT * { { ?s ?p ?o } UNION { GRAPH ?g {?s ?p ?o } } } on the turtle file. In
every result, the fourth line corresponds to the graph g after the first three
(subject, predicate, object)
[START OF OUTPUT]
1
<http://myxyz.com/folder1/exampleulo#part_of>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
2
<http://myxyz.com/folder1/exampleulo#mechanism>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
3
<http://myxyz.com/folder1/exampleulo#carries>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
4
<http://myxyz.com/folder1/exampleulo#Component>
<http://www.w3.org/2000/01/rdf-schema#comment>
"This concept refers to components of a machine."
<http://localhost:3030/ds/data/exmpttl>
5
<http://myxyz.com/folder1/exampleulo#Component>
rdf:type
<http://www.w3.org/2002/07/owl#Class>
<http://localhost:3030/ds/data/exmpttl>
6
<http://myxyz.com/folder1/exampleulo#diagnoses>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
7
<http://myxyz.com/folder1/exampleulo#functionally_part_of>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
8
<http://myxyz.com/folder1/exampleulo>
rdf:type
<http://www.w3.org/2002/07/owl#Ontology>
<http://localhost:3030/ds/data/exmpttl>
9
<http://myxyz.com/folder1/exampleulo>
<http://www.w3.org/2002/07/owl#versionIRI>
<http://myxyz.com/folder1/exampleulo>
<http://localhost:3030/ds/data/exmpttl>
10
<http://myxyz.com/folder1/exampleulo#power_source>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
11
<http://myxyz.com/folder1/exampleulo#contains>
rdf:type
<http://www.w3.org/2002/07/owl#ObjectProperty>
<http://localhost:3030/ds/data/exmpttl>
[END OF THE OUPUT]
Regards
Mahmood
-----Original Message-----
From: Lorenz B. [mailto:[email protected]]
Sent: 20 October 2016 09:15
To: [email protected]
Subject: Re: Fuseki 2.4.0 web user interface
Can you please share the output of the general query? Jjust that we can see
whether the triples have been loaded into a named graph or something which ta
least is not the default graph.
Hi Lorenz,
What I meant by Andy's query statement working is that it returned all the 11
triples of my turtle file. His suggested query contained a union of graph
within the SELECT statement.
SELECT * { { ?s ?p ?o } UNION { GRAPH ?g {?s ?p ?o } } }
Next, I tried the OWL version of the same file both in OWL and RDF/XML format
with the query statement:
prefix owl: <http://www.w3.org/2002/07/owl#> prefix rdfs:
<http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?class ?label ?description WHERE {
?class a owl:Class.
OPTIONAL { ?class rdfs:label ?label}
OPTIONAL { ?class rdfs:comment ?description} } LIMIT 25
This did not return the query result as I expected it to return the only class
it contained.
Perhaps this clarifies it better. I also tried to simply the query (below) but
no results.
SELECT DISTINCT ?c
WHERE {
?c a owl:Class.
}
Any suggestions, I'll appreciate.
Regards
Mahmood
-----Original Message-----
From: Lorenz B. [mailto:[email protected]]
Sent: 20 October 2016 08:52
To: [email protected]
Subject: Re: Fuseki 2.4.0 web user interface
Hello Mahmood,
you said the general query from Andy "works" and now you say that there was no
output. If this query doesn't return anything, your triple store is empty.
,
Lorenz
There was no output at all through the general query.
Now I am working with an OWL file and get all the concepts (It has only one
concept). The query I am running is:
prefix owl: <http://www.w3.org/2002/07/owl#> prefix rdfs:
<http://www.w3.org/2000/01/rdf-schema#>
SELECT DISTINCT ?class ?label ?description WHERE {
?class a owl:Class.
OPTIONAL { ?class rdfs:label ?label}
OPTIONAL { ?class rdfs:comment ?description} } LIMIT 25
The OWL file is uploaded successfully but there is no result of the query.
Any thoughts, I'll appreciate.
Regards
-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: 19 October 2016 15:55
To: [email protected]
Subject: Re: Fuseki 2.4.0 web user interface
On 19/10/16 15:44, Mahmood Ahmad wrote:
Ah, your query works!
I had just missed a '}' character in the end.
Thanks Andy, but why did my query not work. It was:
SELECT ?subject ?predicate ?object
WHERE {
?subject ?predicate ?object
}
LIMIT 25
Please note that I can't see your screen so I can't see what the output to the
general query was.
But I guess it has the G column set. Named graph not default graph.
Regards
-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: 19 October 2016 15:25
To: [email protected]
Subject: Re: Fuseki 2.4.0 web user interface
The list does not pass attachments through.
How are you runnign the server exactly?
Ask this query:
SELECT * { { ?s ?p ?o } UNION { GRAPH ?g {?s ?p ?o } } }
and don't forget to press the "query" button (it caches results otherwise).
Andy
On 19/10/16 14:23, Mahmood Ahmad wrote:
Andy,
I used a simple ulo.ttl file (owl file converted to ttl format) to
upload on dataset /ds (Fuseki 2.4.0) and ran a simple query to get
all triples. The file uploaded correctly but generated no result in
query results portion of the Fuseki v2.4.0 web UI, although there
are
11 triples in ulo.ttl
The ttl file is attached. There was no result from the execution of query, nor
a message of success/failure.
Please can you suggest something so that I could get some output from the query?
Regards
Mahmood
-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: 19 October 2016 13:57
To: [email protected]
Subject: Re: Fuseki 2.4.0 web user interface
Note what it says at the top of the page:
"""
This page covers Fuseki v1. As of Jena 2.13.0, there is also a new
version, Fuseki v2. See Fuseki2 documentation. Both Fuseki v1 and
Fuseki
v2 are currently active and maintained.
"""
You are looking at Fuseki1 documentation.
Andy
On 19/10/16 13:54, Andy Seaborne wrote:
It is looking for a file called tdb.ttl which is not found.
--desc is for a assembler file - you have to provide that, the
documentation is out of date.
If all you eant is some small data for experimentation:
fuseki-server --file <YourData.ttl> /ds
will work
If you have a TDB database,
fuseki-server --loc <YourDB> /ds
Andy
On 19/10/16 12:39, Mahmood Ahmad wrote:
Hi,
[I am using Apache Jena Fuseki 2.4.0 on a Windows 10 machine]
Can anyone please point me to the tdb.ttl for running a few
practice SPARQL queries? The Apache Jena says that TDB is a part
of Apache Jena
3.1.0 on the following page:
http://jena.apache.org/documentation/tdb/index.html
I have installed Fuseki 2.4.0 and I am looking to run the Fuseki
Server with tdb.ttl using the command:
fuseki-server --desc tdb.ttl /ds
as given on the page:
https://jena.apache.org/documentation/serving_data/
The error I get is as follows:
C:\Users\mahmo_myz922s\apache-jena-fuseki-2.4.0\apache-jena-fuseki-2.
4.0>fuseki-server
--desc tdb.ttl /ds
[2016-10-19 12:14:49] Server INFO Dataset from assembler
org.apache.jena.sparql.ARQException: Failed reading assembler
description: Not found: tdb.ttl
at
org.apache.jena.sparql.core.assembler.AssemblerUtils.readAssemble
r
F
i
l
e(AssemblerUtils.java:91)
at
org.apache.jena.sparql.core.assembler.AssemblerUtils.build(Assemb
l
e
r
U
tils.java:104)
at arq.cmdline.ModAssembler.create(ModAssembler.java:72)
at
arq.cmdline.ModDatasetAssembler.createDataset(ModDatasetAssembler.
j
a
v
a:43)
at
org.apache.jena.fuseki.cmd.FusekiCmd$FusekiCmdInner.processModule
s
A
n
d
Args(FusekiCmd.java:284)
at jena.cmd.CmdArgModule.process(CmdArgModule.java:52)
at jena.cmd.CmdMain.mainMethod(CmdMain.java:92)
at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
at
org.apache.jena.fuseki.cmd.FusekiCmd$FusekiCmdInner.innerMain(Fus
e
k
i
C
md.java:102)
at
org.apache.jena.fuseki.cmd.FusekiCmd.main(FusekiCmd.java:67)
Any ideas, I'll appreciate.
Regards
Mahmood
Mahmood Ahmad, PhD
(Semantic Information Architect)
--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
--
Lorenz Bühmann
AKSW group, University of Leipzig
Group: http://aksw.org - semantic web research center
