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Posted to users@jena.apache.org by Eric Scott <er...@att.net> on 2011/09/14 01:35:20 UTC
Configuring assemblers to use inferencers
Hi all -
I'm having some trouble wrapping my head around assemblers that bring
inferencers into the mix.
I have a minimal pair.
This works fine, and I can query the data set in Joseki (but for example
subClassOf links only extend one degree):
<#myDB_RDFSService>
rdf:type joseki:Service;
rdfs:label "Service for MYDB data stored in TDB file, to
which I hope to apply an rdfs inferencer.";
joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
Joseki.
joseki:dataset <#myDB>; # defined below
joseki:processor joseki:ProcessorSPARQL_FixedDS ;
.
<#myDB> rdf:type tdb:DatasetTDB;
rdfs:label "The database";
tdb:location "/home/escott/TDB/myDB";
.
This does not:
<#myDB_RDFSService>
rdf:type joseki:Service;
rdfs:label "Service for MYDB data stored in TDB file using
RDFS inferencer";
joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
Joseki.
joseki:dataset <#myDB_rdfs>; ## <-- THIS CHANGED
joseki:processor joseki:ProcessorSPARQL_FixedDS ;
.
<#myDB_rdfs> ja:baseModel <#myDB>; # defined as above
ja:reasoner [ja:reasonerURL
<http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
.
This last clause I'm taking more or less verbatim from the assembler how-to.
What am I missing?
Thanks for any help!
Regards,
Re: Configuring assemblers to use inferencers
Posted by Eric Scott <er...@att.net>.
Got it. I was not sufficiently mindful of the distinction (and
non-coerce-ability) between a model and a dataset.
Everything worked when I made these declarations:
(after ja:loadClass "com.hp.hpl.jena.tdb.TDB")
tdb:GraphTDB rdfs:subclassOf ja:Model.
<#myDB_graph> rdf:type tdb:GraphTDB;
tdb:location "path/to/tdb-file".
<#my_rdfs_graph> ja:baseModel <#myDB_graph>
ja:reasoner [ja:reasonerURL
<http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>].
<#my_rdfs_dataset> rdf:type ja:RDFDataset;
ja:defaultGraph <#my_rdfs_graph>.
And then pointed the service at the dataset.
Thanks Andy!
On 09/14/2011 05:11 AM, Andy Seaborne wrote:
> Fuseki is easier to use.
>
> On 14/09/11 12:52, Eric Scott wrote:
>> Oh. I should add that the error I get is this:
>>
>> Query execution error: com.hp.hpl.jena.query.QueryExecException:
>>
>> No dataset description for query
>
> That happens where there is no dataset for the execution and no
> description (FROM/FROM NAMED - and you have that turned off by using
> ProcessorSPARQL_FixedDS).
>
> What does the Joseki log file say?
>
>
>
>>
>>
>> On 09/13/2011 04:35 PM, Eric Scott wrote:
>>> Hi all -
>>>
>>> I'm having some trouble wrapping my head around assemblers that bring
>>> inferencers into the mix.
>>>
>>> I have a minimal pair.
>>>
>>> This works fine, and I can query the data set in Joseki (but for
>>> example subClassOf links only extend one degree):
>>>
>>> <#myDB_RDFSService>
>>> rdf:type joseki:Service;
>>> rdfs:label "Service for MYDB data stored in TDB file, to which I hope
>>> to apply an rdfs inferencer.";
>>> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
>>> Joseki.
>>> joseki:dataset <#myDB>; # defined below
>>> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
>>> .
>>>
>>>
>>> <#myDB> rdf:type tdb:DatasetTDB;
>>> rdfs:label "The database";
>>> tdb:location "/home/escott/TDB/myDB";
>>> .
>>>
>>> This does not:
>>>
>>> <#myDB_RDFSService>
>>> rdf:type joseki:Service;
>>> rdfs:label "Service for MYDB data stored in TDB file using RDFS
>>> inferencer";
>>> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
>>> Joseki.
>>> joseki:dataset <#myDB_rdfs>; ## <-- THIS CHANGED
>>> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
>>> .
>>>
>
> Ithink you need you need to include rdf:type ja:RDFDataset ;
>
> <#myDBwithRDFS> rdf:type ja:RDFDataset ;
> ja:defaultGraph <#myRDFS> ;
> .
>
> <#myRDFS> ja:baseModel <#myDB>; # defined as above
> ja:reasoner [ja:reasonerURL
> <http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
>
> .
>
>
> The log file should show nothing happening for <#myDB_rdfs>
>
>
> Andy
>
>>> <#myDB_rdfs> ja:baseModel <#myDB>; # defined as above
>>> ja:reasoner [ja:reasonerURL
>>> <http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
>>>
>>> .
>>>
>>> This last clause I'm taking more or less verbatim from the assembler
>>> how-to.
>>>
>>> What am I missing?
>>>
>>> Thanks for any help!
>>>
>>> Regards,
>>>
>>>
>>
>
Re: Configuring assemblers to use inferencers
Posted by Andy Seaborne <an...@epimorphics.com>.
Fuseki is easier to use.
On 14/09/11 12:52, Eric Scott wrote:
> Oh. I should add that the error I get is this:
>
> Query execution error: com.hp.hpl.jena.query.QueryExecException:
>
> No dataset description for query
That happens where there is no dataset for the execution and no
description (FROM/FROM NAMED - and you have that turned off by using
ProcessorSPARQL_FixedDS).
What does the Joseki log file say?
>
>
> On 09/13/2011 04:35 PM, Eric Scott wrote:
>> Hi all -
>>
>> I'm having some trouble wrapping my head around assemblers that bring
>> inferencers into the mix.
>>
>> I have a minimal pair.
>>
>> This works fine, and I can query the data set in Joseki (but for
>> example subClassOf links only extend one degree):
>>
>> <#myDB_RDFSService>
>> rdf:type joseki:Service;
>> rdfs:label "Service for MYDB data stored in TDB file, to which I hope
>> to apply an rdfs inferencer.";
>> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to Joseki.
>> joseki:dataset <#myDB>; # defined below
>> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
>> .
>>
>>
>> <#myDB> rdf:type tdb:DatasetTDB;
>> rdfs:label "The database";
>> tdb:location "/home/escott/TDB/myDB";
>> .
>>
>> This does not:
>>
>> <#myDB_RDFSService>
>> rdf:type joseki:Service;
>> rdfs:label "Service for MYDB data stored in TDB file using RDFS
>> inferencer";
>> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to Joseki.
>> joseki:dataset <#myDB_rdfs>; ## <-- THIS CHANGED
>> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
>> .
>>
Ithink you need you need to include rdf:type ja:RDFDataset ;
<#myDBwithRDFS> rdf:type ja:RDFDataset ;
ja:defaultGraph <#myRDFS> ;
.
<#myRDFS> ja:baseModel <#myDB>; # defined as above
ja:reasoner [ja:reasonerURL
<http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
.
The log file should show nothing happening for <#myDB_rdfs>
Andy
>> <#myDB_rdfs> ja:baseModel <#myDB>; # defined as above
>> ja:reasoner [ja:reasonerURL
>> <http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
>>
>> .
>>
>> This last clause I'm taking more or less verbatim from the assembler
>> how-to.
>>
>> What am I missing?
>>
>> Thanks for any help!
>>
>> Regards,
>>
>>
>
Re: Configuring assemblers to use inferencers
Posted by Eric Scott <er...@att.net>.
Oh. I should add that the error I get is this:
Query execution error: com.hp.hpl.jena.query.QueryExecException:
No dataset description for query
On 09/13/2011 04:35 PM, Eric Scott wrote:
> Hi all -
>
> I'm having some trouble wrapping my head around assemblers that bring
> inferencers into the mix.
>
> I have a minimal pair.
>
> This works fine, and I can query the data set in Joseki (but for
> example subClassOf links only extend one degree):
>
> <#myDB_RDFSService>
> rdf:type joseki:Service;
> rdfs:label "Service for MYDB data stored in TDB file, to
> which I hope to apply an rdfs inferencer.";
> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
> Joseki.
> joseki:dataset <#myDB>; # defined below
> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
> .
>
>
> <#myDB> rdf:type tdb:DatasetTDB;
> rdfs:label "The database";
> tdb:location "/home/escott/TDB/myDB";
> .
>
> This does not:
>
> <#myDB_RDFSService>
> rdf:type joseki:Service;
> rdfs:label "Service for MYDB data stored in TDB file
> using RDFS inferencer";
> joseki:serviceRef "myDB_RDFS"; # web.xml must route this name to
> Joseki.
> joseki:dataset <#myDB_rdfs>; ## <-- THIS CHANGED
> joseki:processor joseki:ProcessorSPARQL_FixedDS ;
> .
>
> <#myDB_rdfs> ja:baseModel <#myDB>; # defined as above
> ja:reasoner [ja:reasonerURL
> <http://jena.hpl.hp.com/2003/RDFSExptRuleReasoner>]
>
> .
>
> This last clause I'm taking more or less verbatim from the assembler
> how-to.
>
> What am I missing?
>
> Thanks for any help!
>
> Regards,
>
>