On 20/10/16 09:50, Rob Vesse wrote:
You are most likely querying the wrong graph.
Andy’s query should have given you some values for ?g, in order for your
queries to work they need to be adjusted so that they query the appropriate
graph. If you know what the value for the graph name should be then the easiest
way to do this is to add a FROM statement before the WHERE i.e.
SELECT ?someVars
FROM <http://your-graph>
WHERE
{
# Some patterns
}
This is safer:
SELECT ?someVars
WHERE
{
GRAPH <http://your-graph> {
# Some patterns
}
}
Alternatively you need to reload your data such that it is placed into the
default graph
Rob
On 20/10/2016 09:04, "Mahmood Ahmad" <[email protected]> wrote:
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.readAssembler
>>>>> F
>>>>> i
>>>>> l
>>>>> e(AssemblerUtils.java:91)
>>>>>
>>>>> at
>>>>> org.apache.jena.sparql.core.assembler.AssemblerUtils.build(Assembl
>>>>> 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$FusekiCmdInner.processModules
>>>>> A
>>>>> n
>>>>> d
>>>>> Args(FusekiCmd.java:284)
>>>>>
>>>>> at jena.cmd.CmdArgModule.process(CmdArgModule.java:52)
>>>>> at jena.cmd.CmdMain.mainMethod(CmdMain.java:92)
>>>>> at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
>>>>> at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
>>>>> at
>>>>> org.apache.jena.fuseki.cmd.FusekiCmd$FusekiCmdInner.innerMain(Fuse
>>>>> 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
