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Posted to users@jena.apache.org by Tim Harsch <ha...@yahoo.com> on 2013/10/25 19:56:33 UTC
jena-text assembler file not working for me
Hi all,
I was playing around with the new jena-text module. I downloaded from svn the jena-2.11.0 tag and ran the JenaTextExample1 example. It failed with the following error:
Exception in thread "main" org.apache.jena.riot.RiotNotFoundException: Not found: data.ttl
this was simple to fix as the issue was that there was no data.ttl file in the root of the jena-text module. So I created one that looks like so:
@prefix : <http://localhost/jena_example/#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
:T1 rdfs:label "X0 X1 X2" .
:T2 rdfs:label "X10 X11 X12" .
I then ran it again to get the following result:
----------------------------------------------------
| s | label |
====================================================
| <http://localhost/jena_example/#T1> | "X0 X1 X2" |
----------------------------------------------------
Now I simply changed lines 46-47 from:
Dataset ds = createCode() ;
//Dataset ds = createAssembler() ;
to:
//Dataset ds = createCode() ;
Dataset ds = createAssembler() ;
and run it again to get:
-------------
| s | label |
=============
-------------
I looked at the assemble file and don't really see any issues with it. It should just be creating a DatasetTDB for the dataset, rather than the createCode() method's choice to build a dataset via DatasetFactory.createMem()
Any help appreciated.
Thanks,
Tim
Re: jena-text assembler file not working for me
Posted by Andy Seaborne <an...@apache.org>.
On 28/10/13 18:21, Tim Harsch wrote:
> Thanks Andy,
> I didn't think to look at that, because apparently I misunderstood unionDefaultGraph. I thought it was analagous to Allegrograph which treats the default graph as a union of all graphs (default + named).
> According to: http://jena.apache.org/documentation/tdb/assembler.html#union-default-graph
> "An assembler can specify that the default graph for query is the union of the named graphs. "
>
> So does that mean that when data, with triples in the unnamed graph, is loaded into the dataset it is discarded? Or is it retained in a default graph which is just inaccessible by query?
The latter - they go in to the (real) default graph.
unionDefaultGraph is an artifact of query processing.
Andy
>
>
>
>> On Saturday, October 26, 2013 9:21 AM, Andy Seaborne <an...@apache.org> wrote:
>>> T im,
>>
>> The assembler file has
>>
>> tdb:unionDefaultGraph true ;
>>
>> in it; no idea why. The real default graph is loaded with the example data.
>>
>> The example query uses
>> ?s text:query (rdfs:label 'X1') ;
>> rdfs:label ?label
>>
>> so it is accessing the default graph at rdfs:label -- no matches, no
>> results.
>>
>> Remove the tdb:unionDefaultGraph - also try with out the rdfs:label to
>> show the index does return something.
>>
>> Andy
>>
>>
>>
>>
>> On 25/10/13 18:56, Tim Harsch wrote:
>>>
>>>
>>> Hi all,
>>> I was playing around with the new jena-text module. I downloaded from svn
>> the jena-2.11.0 tag and ran the JenaTextExample1 example. It failed with the
>> following error:
>>> Exception in thread "main"
>> org.apache.jena.riot.RiotNotFoundException: Not found: data.ttl
>>>
>>> this was simple to fix as the issue was that there was no data.ttl file in
>> the root of the jena-text module. So I created one that looks like so:
>>> @prefix : <http://localhost/jena_example/#> .
>>> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
>>> :T1 rdfs:label "X0 X1 X2" .
>>> :T2 rdfs:label "X10 X11 X12" .
>>>
>>>
>>> I then ran it again to get the following result:
>>> ----------------------------------------------------
>>> | s | label |
>>> ====================================================
>>> | <http://localhost/jena_example/#T1> | "X0 X1 X2" |
>>> ----------------------------------------------------
>>>
>>> Now I simply changed lines 46-47 from:
>>> Dataset ds = createCode() ;
>>> //Dataset ds = createAssembler() ;
>>>
>>> to:
>>> //Dataset ds = createCode() ;
>>> Dataset ds = createAssembler() ;
>>>
>>> and run it again to get:
>>> -------------
>>> | s | label |
>>> =============
>>> -------------
>>>
>>> I looked at the assemble file and don't really see any issues with it.
>> It should just be creating a DatasetTDB for the dataset, rather than the
>> createCode() method's choice to build a dataset via
>> DatasetFactory.createMem()
>>>
>>> Any help appreciated.
>>>
>>> Thanks,
>>> Tim
>>>
>>
Re: jena-text assembler file not working for me
Posted by Tim Harsch <ha...@yahoo.com>.
Thanks Andy,
I didn't think to look at that, because apparently I misunderstood unionDefaultGraph. I thought it was analagous to Allegrograph which treats the default graph as a union of all graphs (default + named).
According to: http://jena.apache.org/documentation/tdb/assembler.html#union-default-graph
"An assembler can specify that the default graph for query is the union of the named graphs. "
So does that mean that when data, with triples in the unnamed graph, is loaded into the dataset it is discarded? Or is it retained in a default graph which is just inaccessible by query?
> On Saturday, October 26, 2013 9:21 AM, Andy Seaborne <an...@apache.org> wrote:
> >T im,
>
> The assembler file has
>
> tdb:unionDefaultGraph true ;
>
> in it; no idea why. The real default graph is loaded with the example data.
>
> The example query uses
> ?s text:query (rdfs:label 'X1') ;
> rdfs:label ?label
>
> so it is accessing the default graph at rdfs:label -- no matches, no
> results.
>
> Remove the tdb:unionDefaultGraph - also try with out the rdfs:label to
> show the index does return something.
>
> Andy
>
>
>
>
> On 25/10/13 18:56, Tim Harsch wrote:
>>
>>
>> Hi all,
>> I was playing around with the new jena-text module. I downloaded from svn
> the jena-2.11.0 tag and ran the JenaTextExample1 example. It failed with the
> following error:
>> Exception in thread "main"
> org.apache.jena.riot.RiotNotFoundException: Not found: data.ttl
>>
>> this was simple to fix as the issue was that there was no data.ttl file in
> the root of the jena-text module. So I created one that looks like so:
>> @prefix : <http://localhost/jena_example/#> .
>> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
>> :T1 rdfs:label "X0 X1 X2" .
>> :T2 rdfs:label "X10 X11 X12" .
>>
>>
>> I then ran it again to get the following result:
>> ----------------------------------------------------
>> | s | label |
>> ====================================================
>> | <http://localhost/jena_example/#T1> | "X0 X1 X2" |
>> ----------------------------------------------------
>>
>> Now I simply changed lines 46-47 from:
>> Dataset ds = createCode() ;
>> //Dataset ds = createAssembler() ;
>>
>> to:
>> //Dataset ds = createCode() ;
>> Dataset ds = createAssembler() ;
>>
>> and run it again to get:
>> -------------
>> | s | label |
>> =============
>> -------------
>>
>> I looked at the assemble file and don't really see any issues with it.
> It should just be creating a DatasetTDB for the dataset, rather than the
> createCode() method's choice to build a dataset via
> DatasetFactory.createMem()
>>
>> Any help appreciated.
>>
>> Thanks,
>> Tim
>>
>
Re: jena-text assembler file not working for me
Posted by Andy Seaborne <an...@apache.org>.
Tim,
The assembler file has
tdb:unionDefaultGraph true ;
in it; no idea why. The real default graph is loaded with the example data.
The example query uses
?s text:query (rdfs:label 'X1') ;
rdfs:label ?label
so it is accessing the default graph at rdfs:label -- no matches, no
results.
Remove the tdb:unionDefaultGraph - also try with out the rdfs:label to
show the index does return something.
Andy
On 25/10/13 18:56, Tim Harsch wrote:
>
>
> Hi all,
> I was playing around with the new jena-text module. I downloaded from svn the jena-2.11.0 tag and ran the JenaTextExample1 example. It failed with the following error:
> Exception in thread "main" org.apache.jena.riot.RiotNotFoundException: Not found: data.ttl
>
> this was simple to fix as the issue was that there was no data.ttl file in the root of the jena-text module. So I created one that looks like so:
> @prefix : <http://localhost/jena_example/#> .
> @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
> :T1 rdfs:label "X0 X1 X2" .
> :T2 rdfs:label "X10 X11 X12" .
>
>
> I then ran it again to get the following result:
> ----------------------------------------------------
> | s | label |
> ====================================================
> | <http://localhost/jena_example/#T1> | "X0 X1 X2" |
> ----------------------------------------------------
>
> Now I simply changed lines 46-47 from:
> Dataset ds = createCode() ;
> //Dataset ds = createAssembler() ;
>
> to:
> //Dataset ds = createCode() ;
> Dataset ds = createAssembler() ;
>
> and run it again to get:
> -------------
> | s | label |
> =============
> -------------
>
> I looked at the assemble file and don't really see any issues with it. It should just be creating a DatasetTDB for the dataset, rather than the createCode() method's choice to build a dataset via DatasetFactory.createMem()
>
> Any help appreciated.
>
> Thanks,
> Tim
>