Re: [Dbpedia-discussion] how to inference?

Fri, 12 Sep 2008 04:22:14 -0700 

Hi Juisheng
The documentation URL (http://docs.openlinksw.com/virtuoso/ rdfsparqlrule.html#rdfsparqlruleintro) I sent you yesterday includes and example on setting up inferencing for DBpedia as has been done on the live instance we host, have you tried using the example against your local instance ? There doesn't appear be any specific configuration file parameters required for controlling inferencing support. 

Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support



On 12 Sep 2008, at 01:38, jiusheng chen wrote:


Hi Hugh,


Yes, you are right, we have a local Virtuoso instance hosting  
DBpedia datasets.



is it the configuration issue on the server side? we changed values  
for

MaxCheckpointRemap

NumberOfBuffers
MaxDirtyBuffers
TransactionAfterImageLimit

is there any parameter used to control inference?


On Thu, Sep 11, 2008 at 10:51 PM, Hugh Williams  
<[EMAIL PROTECTED]> wrote:

Hi Jiusheng,


The live dbpedia instance is hosted on a Virtuoso 5.0.8 build so I  
would not expect this to be an issue. I presume you have a local  
instance of dbpedia create from the available datasets and hosted  
in Virtuoso ?


Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support



On 11 Sep 2008, at 14:03, jiusheng chen wrote:


Hi Hugh,

I use the Virtuoso open source v5.0.8, is it the reason?


On Thu, Sep 11, 2008 at 7:44 PM, Hugh Williams  
<[EMAIL PROTECTED]> wrote:

Hi Juisheng,

Strange indeed, as the graph clearly exists and is accessible ...


I shall see if anyone internal might have any other possible  
suggestions as to the cause ...


Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support



On 11 Sep 2008, at 12:13, jiusheng chen wrote:


Hi Hugh,

Yes, I have graph 'http://10.120.8.181/dbpedia/sparql/' in local.

[EMAIL PROTECTED]:~$ isql 1111
Connected to OpenLink Virtuoso
Driver: 05.08.3034 OpenLink Virtuoso ODBC Driver
OpenLink Interactive SQL (Virtuoso), version 0.9849b.
Type HELP; for help and EXIT; to exit.

SQL> sparql select count(*) from <http://10.120.8.181/dbpedia/ 
sparql/> { ?s ?p ?o};

callret-0
INTEGER

____________________________________________________________________ 
___________


9124904

1 Rows. -- 61578 msec.


Weird problem.



On Thu, Sep 11, 2008 at 5:47 PM, Hugh Williams  
<[EMAIL PROTECTED]> wrote:

Hi juisheng,


I presume you are trying to build on the inferencing example in   
our online documentation at:



	http://docs.openlinksw.com/virtuoso/ 
rdfsparqlrule.html#rdfsparqlruleintro


which works for me and presumably works for you also ?


Does the graph and triple set for the graph rule used in your  
rdfs_rule_set() call exist ie   http://10.120.8.181/dbpedia/ 
sparql/'   as the error implies it doesn't which I also get not  
having such a graph in my local instance, but if i then create an  
arbitrary graph of that name with the ttlp() function (using the  
data in the documentation example for instance) and run you query  
then it does run successfully even though it obviously returns an  
empty result set  as I don't have any dbpedia data in my test  
server, but proves my point:


$ cat chen

sparql define input:inference 'http://10.120.8.181/dbpedia/sparql/ 
inference'


PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT count(*)
from <http://10.120.8.181/dbpedia/sparql/>
WHERE {

        ?x rdf:type <http://dbpedia.org/class/yago/ 
Conflict100958896> .

};

$ cat chen | ../../../../bin/isql 1112
Connected to OpenLink Virtuoso
Driver: 05.00.3033 OpenLink Virtuoso ODBC Driver
OpenLink Interactive SQL (Virtuoso), version 0.9849b.
Type HELP; for help and EXIT; to exit.

SQL> Type the rest of statement, end with a semicolon (;)> Type  
the rest of statement, end with a semicolon (;)> Type the rest of  
statement, end with a semicolon (;)> Type the rest of statement,  
end with a semicolon (;)> Type the rest of statement, end with a  
semicolon (;)> Type the rest of statement, end with a semicolon  
(;)> Type the rest of statement, end with a semicolon (;)> Type  
the rest of statement, end with a semicolon (;)> Type the rest of  
statement, end with a semicolon (;)> Type the rest of statement,  
end with a semicolon (;)> Type the rest of statement, end with a  
semicolon (;)> Type the rest of statement, end with a semicolon  
(;)> Type the rest of statement, end with a semicolon (;)> Type  
the rest of statement, end with a semicolon (;)> Type the rest of  
statement, end with a semicolon (;)> Type the rest of statement,  
end with a semicolon (;)> Type the rest of statement, end with a  
semicolon (;)> callret-0

INTEGER

____________________________________________________________________ 
___________


0

1 Rows. -- 2 msec.
SQL>


Thus please confirm the graph being used in the rule set does  
exist and is accessible ...


Best Regards
Hugh Williams
Professional Services
OpenLink Software
Web: http://www.openlinksw.com
Support: http://support.openlinksw.com
Forums: http://boards.openlinksw.com/support



On 11 Sep 2008, at 02:48, jiusheng chen wrote:


Hi Hugh,


Always got 'inference context does not exist' error, could you  
please take a look? Here shows my operations:


[EMAIL PROTECTED]:/disk1/sda/jchen/Structured$ cat scripts/inference

rdfs_rule_set('http://10.120.8.181/dbpedia/sparql/inference',  
'http://10.120.8.181/dbpedia/sparql/');
[EMAIL PROTECTED]:/disk1/sda/jchen/Structured$ cat scripts/ 
conflict.sparql



sparql define input:inference 'http://10.120.8.181/dbpedia/ 
sparql/inference'


PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT count(*)
from <http://10.120.8.181/dbpedia/sparql/>
WHERE {

        ?x rdf:type <http://dbpedia.org/class/yago/ 
Conflict100958896> .

};

[EMAIL PROTECTED]:/disk1/sda/jchen/Structured$ cat scripts/ 
inference | isql 1111

Connected to OpenLink Virtuoso
Driver: 05.08.3034 OpenLink Virtuoso ODBC Driver
OpenLink Interactive SQL (Virtuoso), version 0.9849b.
Type HELP; for help and EXIT; to exit.
SQL>
Done. -- 0 msec.

SQL> [EMAIL PROTECTED]:/disk1/sda/jchen/Structured$ cat scripts/ 
conflict.sparql | isql 1111

Connected to OpenLink Virtuoso
Driver: 05.08.3034 OpenLink Virtuoso ODBC Driver
OpenLink Interactive SQL (Virtuoso), version 0.9849b.
Type HELP; for help and EXIT; to exit.

SQL> SQL> Type the rest of statement, end with a semicolon (;)>  
Type the rest of statement, end with a semicolon (;)> Type the  
rest of statement, end with a semicolon (;)> Type the rest of  
statement, end with a semicolon (;)> Type the rest of statement,  
end with a semicolon (;)> Type the rest of statement, end with a  
semicolon (;)> Type the rest of statement, end with a semicolon  
(;)> Type the rest of statement, end with a semicolon (;)> Type  
the rest of statement, end with a semicolon (;)> Type the rest  
of statement, end with a semicolon (;)> Type the rest of  
statement, end with a semicolon (;)> Type the rest of statement,  
end with a semicolon (;)> Type the rest of statement, end with a  
semicolon (;)> Type the rest of statement, end with a semicolon  
(;)> Type the rest of statement, end with a semicolon (;)> Type  
the rest of statement, end with a semicolon (;)> Type the rest  
of statement, end with a semicolon (;)>
*** Error 42000: [Virtuoso Driver][Virtuoso Server]RDF..:  
Inference context http://10.120.8.181/dbpedia/sparql/inference  
does not exist

in lines 2-19 of Top-Level:
#line 2 "(console)"

sparql define input:inference 'http://10.120.8.181/dbpedia/ 
sparql/inference'


PREFIX owl: <http://www.w3.org/2002/07/owl#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX foaf: <http://xmlns.com/foaf/0.1/>
PREFIX dc: <http://purl.org/dc/elements/1.1/>
PREFIX : <http://dbpedia.org/resource/>
PREFIX dbpedia2: <http://dbpedia.org/property/>
PREFIX dbpedia: <http://dbpedia.org/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>

SELECT count(*)
from <http://10.120.8.181/dbpedia/sparql/>
WHERE {

        ?x rdf:type <http://dbpedia.org/class/yago/ 
Conflict100958896> .

}


--
Thanks,
Chen Jiusheng





--
Thanks,
Chen Jiusheng





--
Thanks,
Chen Jiusheng





--
Thanks,
Chen Jiusheng



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