ng4j-namedgraphs — Discussion of Named Graphs in RDF

[namedgraphs] Bring Maven POM up to date with Jena ?

[Jean-Marc V. <jea...@gm...>]

Hi

I tried mvn test with this pom :

<dependency>
  <groupId>org.apache.jena</groupId>
  <artifactId>jena-tdb</artifactId>
  <version>0.10.1</version>
</dependency>

The result is rather bad :
Tests run: 235, Failures: 0, Errors: 104, Skipped: 0

I guess that NG4J uses some deep API in Jena, and upgrading is not easy.
The context is that I'd like to add NG4J in EulerGUI , a semantic GUI
client ( which is up to date with Jena ).

-- 
Jean-Marc Vanel
Déductions SARL - Consulting, services, training,
Rule-based programming, Semantic Web
http://deductions-software.com/
+33 (0)6 89 16 29 52
Twitter: @jmvanel ; chat: irc://irc.freenode.net#eulergui

[namedgraphs] Problem running example

[Anne B. <bj...@si...>]

Hi!
I'm playing around with the Semantic Web Cllient Library. I have been trying to get the example from the website to work, but without luck. Could you tell me what is going wrong with it.

My code is:
public void queryWeb(){

       SemanticWebClient semweb = new SemanticWebClient();
       semweb.getConfig().setValue(SemanticWebClientConfig.MAXSTEPS, "5" );

        // Specify the query.
String queryString1 =   "PREFIX foaf:<http://xmlns.com/foaf/0.1/> " +
"SELECT DISTINCT ?friendsname ?friendshomepage ?foafsname ?foafshomepage  " +
"WHERE {" +
 " { <http://richard.cyganiak.de/foaf.rdf#cygri> foaf:knows ?friend ." +
  "  ?friend foaf:mbox_sha1sum ?mbox . " +
  "  ?friendsURI foaf:mbox_sha1sum ?mbox ." +
  "  ?friendsURI foaf:name ?friendsname ." +
  "  ?friendsURI foaf:homepage ?friendshomepage . }" +
  "  OPTIONAL { ?friendsURI foaf:knows ?foaf ." +
   "            ?foaf foaf:name ?foafsname ." +
   "            ?foaf foaf:homepage ?foafshomepage ." +
   "          } " +
 "  }" ;

// Execute the query and obtain results.
Query query = QueryFactory.create(queryString1);
QueryExecution qe = QueryExecutionFactory.create(query, semweb.asJenaModel("default"));
ResultSet results = qe.execSelect();
//Output query results.
ResultSetFormatter.out(System.out, results, query);

List<String> suc = semweb.successfullyDereferencedURIs();
Set<String> unsuc = semweb.unsuccessfullyDereferencedURIs();
semweb.close();
System.out.println("Successfull uris");
for(String s : suc){System.out.println(s);}
System.out.println("Unsuccessfull uris");
for(String s : unsuc){System.out.println(s);}
  }



and the result is:

INFO: -----------------------------------------------------------------------------------------------
| friendsname             | friendshomepage                       | foafsname | foafshomepage |
===============================================================================================
| "Max Völkel"            | <http://www.xam.de/>                  |           |               |
| "Sven Schwarz"          | <http://www.dfki.uni-kl.de/~schwarz/> |           |               |
| "Arne Handt"            | <http://handtwerk.de/>                |           |               |
| "Arne Handt"            | <http://www.handtwerk.de<http://www.handtwerk.de/>>             |           |               |
| "David Best"            | <http://www.david-best.de/>           |           |               |
| "Giovanni Tummarello"   | <http://g1o.net/>                     |           |               |
| "Thomas Roth-Berghofer" | <http://thomas.roth-berghofer.de/>    |           |               |
| "Robert Tolksdorf"      | <http://www.robert-tolksdorf.de<http://www.robert-tolksdorf.de/>>      |           |               |
-----------------------------------------------------------------------------------------------

INFO: Successfull uris
INFO: Unsuccessfull uris
INFO: http://www.david-best.de/foaf.rdf
INFO: http://thomas.roth-berghofer.de/foaf.xml
INFO: http://www.handtwerk.de/foaf.rdf
INFO: http://people.aifb.kit.edu/mvo/foaf.rdf.xml
INFO: http://leo.gnowsis.com/outlook/contact/00000000ECD4B99358B9814B9DAFE2255CD8AE9A44B42F00
INFO: http://g1o.net/
INFO: http://g1o.net/g1ofoaf.xml
INFO: http://page.mi.fu-berlin.de/best/foaf.rdf
INFO: http://www.david-best.de/

So, I don't seem to be able to get on from the original uri????



Kind regards

Anne

Re: [namedgraphs] Java Generics for NG4J

[Marcus C. <li...@ma...>]

I've cloned the CVS repo onto github, and re-created most of this patch against the latest revision.

https://github.com/leth/ng4j

Regards,
Marcus

On 10/02/2011 09:20, Marcus Cobden wrote:
> Attached is a (gzipped) patch to v0.9.3 which adds java generics to NG4J.
>
> Also, the patch cleans up a bunch of compiler warnings and tidies up the import statements.
>
> Regards,
> Marcus Cobden

[namedgraphs] Inconsistent RDF Signatures?

[landong z. <lan...@go...>]

Hi,

I am using SWPNamedGraphSet.assertWithSignature function to semantically
sign two N-triple files with the same semantic statements.

The N-triple files are from the different states of the publishing work
flow, i.e. before/after the file being loaded into the triple-store.

These two files might be slightly different in terms of order-of-triples and
naming-of-Bnode.  The equality of semantic is proven by Jena
Model.isIsomorphic() function as True.

Presumably, what I got from two files would be the same signature regardless
the meaningless change of the RDF serialisation. However, I am surprised to
receive two different signatures from NG4J output. Can anyone help me to
understand the cause of difference? or I've missed out any significant
concept? Thanks in advance.

The following is how the N-triple file is signed:

ArrayList<Node> propertiestoBePublished = new ArrayList<Node>();
            propertiestoBePublished.add(SWP.X509Certificate);

            result = set.assertWithSignature(auth,
                        SWP.JjcRdfC14N_rsa_sha1,
                        SWP.JjcRdfC14N_sha1,
                        propertiestoBePublished,
                        p12keystore,
                        password);
            set.write(output, "RDF/XML", "");



I can attach more details if it would help.

Regards,

Landong

Re: [namedgraphs] [Semantic Web Client Library] Sindice support

[Cristina S. <csa...@vi...>]

Thanks for the information.

Kind regards,

Cristina

2011/6/10 Olaf Hartig <ha...@in...>

> Hello Cristina,
>
> No, SWClLib does not support v2 or v3 of the Sindice API. You may
> instead use SQUIN (http://squin.org) which -since a few weeks- contains
> its own link traversal based query system. This query system provides the
> same functionality as SWClLib. I just released a new version of SQUIN for
> which I reimplemented the URI search component. This component accesses
> v2 of the Sindice API.
>
> Cheers,
> Olaf
>
>
>
> On Tuesday 07 June 2011 23:48:34 Cristina Sarasua wrote:
> > Hi,
> >
> > I would like to ask whether the Semantic Web Client Library also supports
> > Sindice API v2 or v3.
> >
> > After running this command:
> >
> > sh ./bin/semwebquery -verbose -maxsteps 5 -sindice -sparql "PREFIX foaf:
> <
> > http://xmlns.com/foaf/0.1/> PREFIX rdf: <
> > http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?s WHERE {?s
> rdf:type
> > foaf:Person}"
> >
> > I get this information:
> >
> > DEBUG [URISearchThread_16] (SemanticWebClient.java:434) - Searching
> failed
> > (Execution failed: Unexpected response code: 400 (
> >
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> > 0.1%2FPerson)): http://xmlns.com/foaf/0.1/Person
> > de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessingException:
> > Execution failed: Unexpected response code: 400 (
> >
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> > 0.1%2FPerson )
> >     at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.proc
> > ess(HTTPbasedQueryProcessor.java:40) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessorSindice.proces
> > s(QueryProcessorSindice.java:54) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(
> > URISearchThread.java:46) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(
> > URISearchThread.java:27) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.threadutils.TaskExecutorBase.run(TaskE
> > xecutorBase.java:100) Caused by:
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor$Quer
> > yExecutionException: Unexpected response code: 400 (
> >
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> > 0.1%2FPerson )
> >     at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.chec
> > kResult(HTTPbasedQueryProcessor.java:106) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.exec
> > uteQuery(HTTPbasedQueryProcessor.java:76) at
> >
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.proc
> > ess(HTTPbasedQueryProcessor.java:38) ... 4 more
> >
> > Clicking on the URL referenced I get:
> >
> > "This api v1 is deprecated and has been disabled. Please switch to api v2
> > or v3. See documentation at http://sindice.com/developers/welcome"
> >
> > Thanks in advance.
> >
> > Kind regards,
> >
> > Cristina
>



-- 

Cristina Sarasua Garmendia
Investigadora / Researcher
eTurismo y Patrimonio / eTourism & Cultural Heritage

Vicomtech-IK4 - Visual Interaction Communication Technologies
Mikeletegi Pasealekua, 57 - Parque Tecnológico
20009 Donostia - San Sebastián - Spain
Tel: +[34] 943 30 92 30
Fax: +[34] 943 30 93 93
e-mail: csa...@vi...
www.vicomtech.org

*** member of IK4 Research Alliance ****
www.ik4.es
*** member of GraphicsMedia.net ****
www.graphicsmedia.net

-----------------------------------------------------
Vicomtech-IK4 is an ISO 9001:2000 certified institute
-----------------------------------------------------

Este mensaje se dirige exclusivamente a su destinatario. La información
incluida en el presente correo es confidencial sometida a secreto
profesional, especialmente en lo que respecta a los datos de carácter
personal, cuya divulgación está prohibida, en virtud de la legislación
vigente. Si usted no es el destinatario legítimo y lo ha recibido por error
o tiene conocimiento del mismo por cualquier motivo, le rogamos que nos lo
comunique por este medio y proceda a destruirlo o borrarlo. En todo caso
abstengase de utilizar, reproducir, alterar, archivar o comunicar a terceros
el presente mensaje así como los ficheros anexos, todo ello bajo pena de
incurrir en responsabilidades legales. Cualquier opinión contenida en este
correo es exclusiva de su autor y no representa necesariamente la opinión de
ASOCIACIÓN CENTRO DE TECNOLOGÍAS DE INTERACCIÓN VISUAL Y COMUNICACIONES
VICOMTECH (en adelante Vicomtech-IK4) El emisor no garantiza la integridad,
rapidez o seguridad del presente correo, ni se responsabiliza de posibles
perjuicios derivados de la captura, incorporaciones de virus o cualesquiera
otras manipulaciones efectuadas por terceros. Con motivo de la entrada en
vigor de la Ley 34/2002, de 11 de julio, de Servicios de la Sociedad de la
Información y de Comercio Electrónico, le informamos que pueden revocar en
cualquier momento, de forma sencilla y gratuita, el consentimiento para la
recepción de mensajes de vicomtech.org en inf...@vi....

Re: [namedgraphs] [Semantic Web Client Library] Sindice support

[Olaf H. <ha...@in...>]

Hello Cristina,

No, SWClLib does not support v2 or v3 of the Sindice API. You may
instead use SQUIN (http://squin.org) which -since a few weeks- contains
its own link traversal based query system. This query system provides the
same functionality as SWClLib. I just released a new version of SQUIN for 
which I reimplemented the URI search component. This component accesses
v2 of the Sindice API.

Cheers,
Olaf



On Tuesday 07 June 2011 23:48:34 Cristina Sarasua wrote:
> Hi,
> 
> I would like to ask whether the Semantic Web Client Library also supports
> Sindice API v2 or v3.
> 
> After running this command:
> 
> sh ./bin/semwebquery -verbose -maxsteps 5 -sindice -sparql "PREFIX foaf: <
> http://xmlns.com/foaf/0.1/> PREFIX rdf: <
> http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?s WHERE {?s rdf:type
> foaf:Person}"
> 
> I get this information:
> 
> DEBUG [URISearchThread_16] (SemanticWebClient.java:434) - Searching failed
> (Execution failed: Unexpected response code: 400 (
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> 0.1%2FPerson)): http://xmlns.com/foaf/0.1/Person
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessingException:
> Execution failed: Unexpected response code: 400 (
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> 0.1%2FPerson )
>     at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.proc
> ess(HTTPbasedQueryProcessor.java:40) at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessorSindice.proces
> s(QueryProcessorSindice.java:54) at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(
> URISearchThread.java:46) at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(
> URISearchThread.java:27) at
> de.fuberlin.wiwiss.ng4j.semwebclient.threadutils.TaskExecutorBase.run(TaskE
> xecutorBase.java:100) Caused by:
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor$Quer
> yExecutionException: Unexpected response code: 400 (
> http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F
> 0.1%2FPerson )
>     at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.chec
> kResult(HTTPbasedQueryProcessor.java:106) at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.exec
> uteQuery(HTTPbasedQueryProcessor.java:76) at
> de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.proc
> ess(HTTPbasedQueryProcessor.java:38) ... 4 more
> 
> Clicking on the URL referenced I get:
> 
> "This api v1 is deprecated and has been disabled. Please switch to api v2
> or v3. See documentation at http://sindice.com/developers/welcome"
> 
> Thanks in advance.
> 
> Kind regards,
> 
> Cristina

[namedgraphs] [Semantic Web Client Library] Sindice support

[Cristina S. <csa...@vi...>]

Hi,

I would like to ask whether the Semantic Web Client Library also supports
Sindice API v2 or v3.

After running this command:

sh ./bin/semwebquery -verbose -maxsteps 5 -sindice -sparql "PREFIX foaf: <
http://xmlns.com/foaf/0.1/> PREFIX rdf: <
http://www.w3.org/1999/02/22-rdf-syntax-ns#> SELECT ?s WHERE {?s rdf:type
foaf:Person}"

I get this information:

DEBUG [URISearchThread_16] (SemanticWebClient.java:434) - Searching failed
(Execution failed: Unexpected response code: 400 (
http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2FPerson)):
http://xmlns.com/foaf/0.1/Person
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessingException:
Execution failed: Unexpected response code: 400 (
http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2FPerson
)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.process(HTTPbasedQueryProcessor.java:40)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.QueryProcessorSindice.process(QueryProcessorSindice.java:54)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(URISearchThread.java:46)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.URISearchThread.executeTask(URISearchThread.java:27)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.threadutils.TaskExecutorBase.run(TaskExecutorBase.java:100)
Caused by:
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor$QueryExecutionException:
Unexpected response code: 400 (
http://sindice.com/query/lookup?page=1&uri=http%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2FPerson
)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.checkResult(HTTPbasedQueryProcessor.java:106)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.executeQuery(HTTPbasedQueryProcessor.java:76)
    at
de.fuberlin.wiwiss.ng4j.semwebclient.urisearch.HTTPbasedQueryProcessor.process(HTTPbasedQueryProcessor.java:38)
    ... 4 more

Clicking on the URL referenced I get:

"This api v1 is deprecated and has been disabled. Please switch to api v2 or
v3. See documentation at http://sindice.com/developers/welcome"

Thanks in advance.

Kind regards,

Cristina

-- 

Cristina Sarasua Garmendia
Investigadora / Researcher
eTurismo y Patrimonio / eTourism & Cultural Heritage

Vicomtech-IK4 - Visual Interaction Communication Technologies
Mikeletegi Pasealekua, 57 - Parque Tecnológico
20009 Donostia - San Sebastián - Spain
Tel: +[34] 943 30 92 30
Fax: +[34] 943 30 93 93
e-mail: csa...@vi...
www.vicomtech.org

*** member of IK4 Research Alliance ****
www.ik4.es
*** member of GraphicsMedia.net ****
www.graphicsmedia.net

-----------------------------------------------------
Vicomtech-IK4 is an ISO 9001:2000 certified institute
-----------------------------------------------------

Este mensaje se dirige exclusivamente a su destinatario. La información
incluida en el presente correo es confidencial sometida a secreto
profesional, especialmente en lo que respecta a los datos de carácter
personal, cuya divulgación está prohibida, en virtud de la legislación
vigente. Si usted no es el destinatario legítimo y lo ha recibido por error
o tiene conocimiento del mismo por cualquier motivo, le rogamos que nos lo
comunique por este medio y proceda a destruirlo o borrarlo. En todo caso
abstengase de utilizar, reproducir, alterar, archivar o comunicar a terceros
el presente mensaje así como los ficheros anexos, todo ello bajo pena de
incurrir en responsabilidades legales. Cualquier opinión contenida en este
correo es exclusiva de su autor y no representa necesariamente la opinión de
ASOCIACIÓN CENTRO DE TECNOLOGÍAS DE INTERACCIÓN VISUAL Y COMUNICACIONES
VICOMTECH (en adelante Vicomtech-IK4) El emisor no garantiza la integridad,
rapidez o seguridad del presente correo, ni se responsabiliza de posibles
perjuicios derivados de la captura, incorporaciones de virus o cualesquiera
otras manipulaciones efectuadas por terceros. Con motivo de la entrada en
vigor de la Ley 34/2002, de 11 de julio, de Servicios de la Sociedad de la
Información y de Comercio Electrónico, le informamos que pueden revocar en
cualquier momento, de forma sencilla y gratuita, el consentimiento para la
recepción de mensajes de vicomtech.org en inf...@vi....

Re: [namedgraphs] Updated build to Maven3

[Olaf H. <ha...@in...>]

Hey Tim,

On Tuesday 10 May 2011 15:29:00 Tim Pizey wrote:
> There are later versions available for most dependencies:
> [...]
> I performed this locally and then built and regenerated site,
> so these updates could be applied.

Feel free to commit.

Unfortunately, I won't find the time in the future to work on NG4J.

Greetings,
Olaf

Re: [namedgraphs] Updated build to Maven3

[Olaf H. <ha...@in...>]

Hey Tim,

On Tuesday 10 May 2011 15:13:44 Tim Pizey wrote:
> Hi
> 
> I have updated the pom.xml to maven3.
> 
> This means explicit version numbers for all plugins, a retrograde step
> in my view.

Thanks!

> It would be really nice to have the dependency upon GRDDL 0.3 removed,
> as this is not in any maven repositories, so I have to host it at
> http://paneris.net/maven2/com/hp/hpl/jena/grddl/

I removed GRDDL support in SWClLib (it was already deprecated in NG4J 0.9.1).

Cheers,
Olaf


> The ant build still calls some failing tests, I have not investigated.
> 
> The compile dependency upon    com.hp.hpl.jena.jena-2.6.4-tests is a bad
> smell.
> 
> CyberNeko HTML Parser  is now at version 1.9.14
> 
> The Maven generated site: http://paneris.net/ng4j/project-reports.html
> The Jenkins build:  http://jenkins.paneris.net/job/ng4j/
> The maven repository: http://paneris.net/maven2/
> The deployed artifact: 
> http://paneris.net/maven2/de/fuberlin/wiwss/ng4j/ng4j/
> 
> cheers
> Tim

Re: [namedgraphs] Updated build to Maven3

[Tim P. <ti...@pa...>]

There are later versions available for most dependencies:

mvn versions:use-latest-versions
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building NG4J 0.9.4-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- versions-maven-plugin:1.2:use-latest-versions (default-cli) @ ng4j --
-
[INFO] Updated antlr:antlr:jar:null:2.7.7 to version 20030911
[INFO] Updated commons-codec:commons-codec:jar:null:1.3 to version 1.5
[INFO] Updated log4j:log4j:jar:null:1.2.14 to version 1.2.16
[INFO] Updated hsqldb:hsqldb:jar:null:1.8.0.7 to version 1.8.0.10
[INFO] Updated junit:junit:jar:null:3.8.2 to version 4.8.2
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.293s
[INFO] Finished at: Tue May 10 14:24:28 BST 2011
[INFO] Final Memory: 7M/504M
[INFO] ------------------------------------------------------------------------



I performed this locally and then built and regenerated site,
so these updates could be applied.

cheers
Tim

-- 
Tim Pizey
http://pizey.net/~timp

[namedgraphs] Updated build to Maven3

[Tim P. <ti...@pa...>]

Hi

I have updated the pom.xml to maven3.

This means explicit version numbers for all plugins, a retrograde step
in my view.

It would be really nice to have the dependency upon GRDDL 0.3 removed,
as this is not in any maven repositories, so I have to host it at
http://paneris.net/maven2/com/hp/hpl/jena/grddl/

The ant build still calls some failing tests, I have not investigated.

The compile dependency upon    com.hp.hpl.jena.jena-2.6.4-tests is a bad smell.

CyberNeko HTML Parser  is now at version 1.9.14

The Maven generated site: http://paneris.net/ng4j/project-reports.html
The Jenkins build:  http://jenkins.paneris.net/job/ng4j/
The maven repository: http://paneris.net/maven2/
The deployed artifact:  http://paneris.net/maven2/de/fuberlin/wiwss/ng4j/ng4j/

cheers
Tim







-- 
Tim Pizey
http://pizey.net/~timp

[namedgraphs] problem using ng4j

[wenlei z. <wen...@gm...>]

Hi, guys
When I execute "semwebquery -sparqlfile tabulator-devs.sparql
-retrieveduris". I get such result:

-----------------------------
| name | mbox | projectName |
=============================
-----------------------------
Successfully dereferenced URIs:

http://usefulinc.com/ns/doap
--------------------------------

The tabulator-devs.sparql's content is as same as Example1 in
http://www4.wiwiss.fu-berlin.de/bizer/ng4j/semwebclient/index.html#sindice .
However, the result is not the same as the tutorial's.

I don't know where the problem comes from. Does anybody know the answer?
Thank you very much!

Zhou Wenlei

[namedgraphs] Java Generics for NG4J

[Marcus C. <li...@ma...>]

Attached is a (gzipped) patch to v0.9.3 which adds java generics to NG4J.

Also, the patch cleans up a bunch of compiler warnings and tidies up the import statements.

Regards,
Marcus Cobden

Re: [namedgraphs] Reasoning with Named Graphs

[Graeme S. <ac...@gm...>]

On 9 February 2011 21:44, Marcus Cobden <li...@ma...> wrote:

> One of the things I wanted was for the inferred triples to be placed in
> different graphs, depending on which graphs the antecedents came from. Would
> that be possible?
>
>
Yes, this is straightforward. As an example, here's the Jess version of the
RDFS rule for inferring the type of a resource from a property domain:

  ;;; prp-dom: infer resource type from property domain

  (defrule prp-dom (declare (salience 100))
   (logan-quad
    (graph ?g)
    (subject ?p)
    (predicate "http://www.w3.org/2000/01/rdf-schema#domain")
    (object ?t)
   )
   (logan-quad
    (graph ?h)
    (subject ?s)
    (predicate ?p)
    (object ?o)
   )
   =>
   (assert
    (logan-quad
     (graph "urn://inferred")
     (subject ?s)
     (predicate "http://www.w3.org/1999/02/22-rdf-syntax-ns#type")
     (object ?t)
    )
   )
)


While in this instance the consequent asserts the entailed triple in the
"urn://inferred" graph, you can easily set this to be ?g, ?h (the graphs in
the anticedents), or define a function that selects somewhere else for it to
go.


>
> Btw: I spent an hour or so today adding generics to all the NG4J classes,
> if you're working with NG4J it might make things a bit easier ;) I'll be
> posting the diff tomorrow.
>
>
Sounds useful!

Cheers,
Graeme.

Re: [namedgraphs] Reasoning with Named Graphs

[Marcus C. <li...@ma...>]

That's what I've done, thanks. Though I've had to extend about 6 classes along the way, to get down to RETEConflictSet where the magic happens :P

The RuleDerivation logs most of the stuff, but not what created the rule in the first place (things like sub-properties create new rules).

On 09/02/2011 21:50, Chris Shellenbarger wrote:
> The derivation logging object in Jena (RuleDerivation.java) contains the whole picture of what triggered the rule.  You'll have to extend/override the area where Jena actually does the logging, but the information that you need is there.
>
> Hope that helps a little.
>
> Chris
>
> -----Original Message-----
> From: Marcus Cobden [mailto:li...@ma...]
> Sent: Wednesday, February 09, 2011 2:44 PM
> To: ng4...@li...
> Subject: Re: [namedgraphs] Reasoning with Named Graphs
>
> Looks promising, thanks!
>
> One of the things I wanted was for the inferred triples to be placed in different graphs, depending on which graphs the antecedents came from. Would that be possible?
>
> This isn't possible with the Jena Reasoner: while you can enable derivation logging, it doesn't log what triggered the creation of a rule, so you don't get the full picture.
>
> Btw: I spent an hour or so today adding generics to all the NG4J classes, if you're working with NG4J it might make things a bit easier ;) I'll be posting the diff tomorrow.
>
> On 09/02/2011 20:36, Graeme Stevenson wrote:
>> Hi Marcus,
>>
>> I developed an extension for NG4J that uses Jess as a back end. The software is available from [1].
>>
>> I didn't get around to finishing the RDFS and OWL rules files for Jess when I first published the code, as work took me in another direction. However, I've turned my attention back to it this week and should hopefully get something online soon. Nevertheless, you can always have a look to see if it fits your needs.
>>
>> Give me a shout if you've got any questions.
>>
>> Cheers,
>> Graeme.
>>
>>    [1] Logan: http://logan.ontonym.org/
>>
>> On 9 February 2011 14:32, Marcus Cobden<li...@ma...<mailto:li...@ma...>>  wrote:
>>
>>      Has anyone created a reasoner which works over named graphs?
>>
>>      Thanks,
>>      Marcus
>>
>>      ------------------------------------------------------------------------------
>>      The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
>>      Pinpoint memory and threading errors before they happen.
>>      Find and fix more than 250 security defects in the development cycle.
>>      Locate bottlenecks in serial and parallel code that limit performance.
>>      http://p.sf.net/sfu/intel-dev2devfeb
>>      _______________________________________________
>>      ng4j-namedgraphs mailing list
>>      ng4...@li...<mailto:ng4...@li...>
>>      https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>>
>>
>>
>>
>> ----------------------------------------------------------------------
>> -------- The ultimate all-in-one performance toolkit: Intel(R)
>> Parallel Studio XE:
>> Pinpoint memory and threading errors before they happen.
>> Find and fix more than 250 security defects in the development cycle.
>> Locate bottlenecks in serial and parallel code that limit performance.
>> http://p.sf.net/sfu/intel-dev2devfeb
>>
>>
>>
>> _______________________________________________
>> ng4j-namedgraphs mailing list
>> ng4...@li...
>> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>
>
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
> _______________________________________________
> ng4j-namedgraphs mailing list
> ng4...@li...
> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>

Re: [namedgraphs] Reasoning with Named Graphs

[Chris S. <chr...@is...>]

The derivation logging object in Jena (RuleDerivation.java) contains the whole picture of what triggered the rule.  You'll have to extend/override the area where Jena actually does the logging, but the information that you need is there.

Hope that helps a little.

Chris

-----Original Message-----
From: Marcus Cobden [mailto:li...@ma...] 
Sent: Wednesday, February 09, 2011 2:44 PM
To: ng4...@li...
Subject: Re: [namedgraphs] Reasoning with Named Graphs

Looks promising, thanks!

One of the things I wanted was for the inferred triples to be placed in different graphs, depending on which graphs the antecedents came from. Would that be possible?

This isn't possible with the Jena Reasoner: while you can enable derivation logging, it doesn't log what triggered the creation of a rule, so you don't get the full picture.

Btw: I spent an hour or so today adding generics to all the NG4J classes, if you're working with NG4J it might make things a bit easier ;) I'll be posting the diff tomorrow.

On 09/02/2011 20:36, Graeme Stevenson wrote:
> Hi Marcus,
>
> I developed an extension for NG4J that uses Jess as a back end. The software is available from [1].
>
> I didn't get around to finishing the RDFS and OWL rules files for Jess when I first published the code, as work took me in another direction. However, I've turned my attention back to it this week and should hopefully get something online soon. Nevertheless, you can always have a look to see if it fits your needs.
>
> Give me a shout if you've got any questions.
>
> Cheers,
> Graeme.
>
>   [1] Logan: http://logan.ontonym.org/
>
> On 9 February 2011 14:32, Marcus Cobden <li...@ma... <mailto:li...@ma...>> wrote:
>
>     Has anyone created a reasoner which works over named graphs?
>
>     Thanks,
>     Marcus
>
>     ------------------------------------------------------------------------------
>     The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
>     Pinpoint memory and threading errors before they happen.
>     Find and fix more than 250 security defects in the development cycle.
>     Locate bottlenecks in serial and parallel code that limit performance.
>     http://p.sf.net/sfu/intel-dev2devfeb
>     _______________________________________________
>     ng4j-namedgraphs mailing list
>     ng4...@li... <mailto:ng4...@li...>
>     https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>
>
>
>
> ----------------------------------------------------------------------
> -------- The ultimate all-in-one performance toolkit: Intel(R) 
> Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
>
>
>
> _______________________________________________
> ng4j-namedgraphs mailing list
> ng4...@li...
> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs


------------------------------------------------------------------------------
The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
Pinpoint memory and threading errors before they happen.
Find and fix more than 250 security defects in the development cycle.
Locate bottlenecks in serial and parallel code that limit performance.
http://p.sf.net/sfu/intel-dev2devfeb
_______________________________________________
ng4j-namedgraphs mailing list
ng4...@li...
https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs

Re: [namedgraphs] Reasoning with Named Graphs

[Marcus C. <li...@ma...>]

Looks promising, thanks!

One of the things I wanted was for the inferred triples to be placed in different graphs, depending on which graphs the antecedents came from. Would that be possible?

This isn't possible with the Jena Reasoner: while you can enable derivation logging, it doesn't log what triggered the creation of a rule, so you don't get the full picture.

Btw: I spent an hour or so today adding generics to all the NG4J classes, if you're working with NG4J it might make things a bit easier ;) I'll be posting the diff tomorrow.

On 09/02/2011 20:36, Graeme Stevenson wrote:
> Hi Marcus,
>
> I developed an extension for NG4J that uses Jess as a back end. The software is available from [1].
>
> I didn't get around to finishing the RDFS and OWL rules files for Jess when I first published the code, as work took me in another direction. However, I've turned my attention back to it this week and should hopefully get something online soon. Nevertheless, you can always have a look to see if it fits your needs.
>
> Give me a shout if you've got any questions.
>
> Cheers,
> Graeme.
>
>   [1] Logan: http://logan.ontonym.org/
>
> On 9 February 2011 14:32, Marcus Cobden <li...@ma... <mailto:li...@ma...>> wrote:
>
>     Has anyone created a reasoner which works over named graphs?
>
>     Thanks,
>     Marcus
>
>     ------------------------------------------------------------------------------
>     The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
>     Pinpoint memory and threading errors before they happen.
>     Find and fix more than 250 security defects in the development cycle.
>     Locate bottlenecks in serial and parallel code that limit performance.
>     http://p.sf.net/sfu/intel-dev2devfeb
>     _______________________________________________
>     ng4j-namedgraphs mailing list
>     ng4...@li... <mailto:ng4...@li...>
>     https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>
>
>
>
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
>
>
>
> _______________________________________________
> ng4j-namedgraphs mailing list
> ng4...@li...
> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs

Re: [namedgraphs] Reasoning with Named Graphs

[Graeme S. <ac...@gm...>]

Hi Marcus,

I developed an extension for NG4J that uses Jess as a back end. The software
is available from [1].

I didn't get around to finishing the RDFS and OWL rules files for Jess when
I first published the code, as work took me in another direction. However,
I've turned my attention back to it this week and should hopefully get
something online soon. Nevertheless, you can always have a look to see if it
fits your needs.

Give me a shout if you've got any questions.

Cheers,
Graeme.

 [1] Logan: http://logan.ontonym.org/

On 9 February 2011 14:32, Marcus Cobden <li...@ma...> wrote:

> Has anyone created a reasoner which works over named graphs?
>
> Thanks,
> Marcus
>
>
> ------------------------------------------------------------------------------
> The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE:
> Pinpoint memory and threading errors before they happen.
> Find and fix more than 250 security defects in the development cycle.
> Locate bottlenecks in serial and parallel code that limit performance.
> http://p.sf.net/sfu/intel-dev2devfeb
> _______________________________________________
> ng4j-namedgraphs mailing list
> ng4...@li...
> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs
>

[namedgraphs] Reasoning with Named Graphs

[Marcus C. <li...@ma...>]

Has anyone created a reasoner which works over named graphs?

Thanks,
Marcus

Re: [namedgraphs] [SWClLib] problem running a simple example

[Frederic R. <fre...@un...>]

Olaf,

thanks for taking into account my problem (and for opening your code).

Le 12/01/2011 12:53, Olaf Hartig a écrit :
> Hello Frédéric,
>
> You may try to increase the number of maximal depth of link following a bit.
> To do this you just have to add the following line after the creation of the
> semweb object:
>
>   semweb.getConfig().setValue( SemanticWebClientConfig.MAXSTEPS, "5" );
>
> Please report whether that helped.
>
Well it doesn't changed anything...
so I tried another way using a triple query :
---------------------------------------------------------
     SemanticWebClient semweb = new SemanticWebClient();
     semweb.getConfig().setValue(SemanticWebClientConfig.MAXSTEPS,"5");
     Triple triple = new Triple(
         Node.createURI("http://www.w3.org/People/Berners-Lee/card#i"),
         Node.createURI("http://xmlns.com/foaf/0.1/knows"),
         Node.ANY
     );
     SemWebIterator iter = semweb.find(triple);
     System.out.println("find returns");
     while (iter.hasNext()) {
       SemWebTriple t = iter.next();
       if 
(t.predicateMatches(Node.createURI("http://xmlns.com/foaf/0.1/knows"))){
         System.out.println("triple match, object="+t.getObject());
       }
     }
     System.out.println("no more triple");
     semweb.close();
---------------------------------------------------------

but it doesnt found anything neither :

---------------------------------------------------------
find returns
no more triple
---------------------------------------------------------

But when I rewrite the triple pattern as :

---------------------------------------------------------
Triple triple = new Triple(
         Node.createURI("http://www.w3.org/People/Berners-Lee/card#i"),
         Node.ANY,
         Node.ANY
     );
---------------------------------------------------------

58 triple matches are reported :

---------------------------------------------------------
find returns
triple match, object=http://www.cs.umd.edu/~hendler/2003/foaf.rdf#jhendler
triple match, object=http://my.opera.com/chaals/xml/foaf#me
triple match, object=http://people.w3.org/simon/foaf#i
triple match, object=http://dbpedia.org/resource/John_Gage
triple match, object=http://www.lassila.org/ora.rdf#me
triple match, object=http://eikeon.com/foaf.rdf#eikeon
triple match, object=http://presbrey.mit.edu/foaf.rdf#presbrey
triple match, object=http://qdos.com/people/tom.xrdf#me
triple match, object=http://www.w3.org/People/Berners-Lee/card#amy
triple match, object=http://dbpedia.org/resource/John_Klensin
triple match, object=http://www.w3.org/People/EM/contact#me
triple match, 
object=http://www.mindswap.org/2004/owl/mindswappers#Bijan.Parsia
triple match, object=http://people.apache.org/~oshani/foaf.rdf#me
triple match, object=http://dig.csail.mit.edu/People/RRS
triple match, object=http://people.csail.mit.edu/lkagal/foaf#me
triple match, object=http://teole.jfouffa.org/People/Teole/card.rdf#me
triple match, object=http://www.aaronsw.com/about.xrdf#aaronsw
triple match, object=http://dig.csail.mit.edu/2007/wiki/people/JoeLambda#JL
triple match, object=http://people.csail.mit.edu/psz/foaf.rdf#me
triple match, object=http://dig.csail.mit.edu/People/yosi#YES
triple match, object=http://dbpedia.org/resource/Tim_Bray
triple match, object=http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf#edd
triple match, object=http://web.mit.edu/shinnyih/foaf.rdf#
triple match, object=http://danbri.org/foaf#danbri
triple match, object=http://rit.mellon.org/Members/ihf/foaf.rdf#me
triple match, object=http://dbpedia.org/resource/John_Markoff
triple match, object=http://research.microsoft.com/~henrikn/foaf.xml#me
triple match, object=http://id.ecs.soton.ac.uk/person/60
triple match, object=http://www.w3.org/People/karl/karl-foaf.xrdf#me
triple match, 
object=http://www.mindswap.org/2004/owl/mindswappers#Jennifer.Golbeck
triple match, object=http://id.ecs.soton.ac.uk/person/2686
triple match, object=http://norman.walsh.name/knows/who#norman-walsh
triple match, object=http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf#ss
triple match, object=http://www.dajobe.org/foaf.rdf#i
triple match, object=http://www.isi.edu/~gil/foaf.rdf#me
triple match, object=http://web.mit.edu/ruthdhan/www/foaf.rdf#ruthdhan
triple match, object=http://my.opera.com/howcome/xml/foaf#howcome
triple match, object=http://www.w3.org/People/djweitzner/foaf#DJW
triple match, object=http://www.w3.org/People/Connolly/#me
triple match, object=http://www.ivan-herman.net/foaf.rdf#me
triple match, object=http://id.ecs.soton.ac.uk/person/1269
triple match, object=http://www.w3.org/People/Jacobs/contact.rdf#IanJacobs
triple match, object=http://people.csail.mit.edu/ryanlee/about#ryanlee
triple match, object=http://inamidst.com/sbp/foaf#Sean
triple match, object=http://people.csail.mit.edu/crowell/foaf.rdf#crowell
triple match, object=http://myopenlink.net/dataspace/person/kidehen#this
triple match, 
object=http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf#libby
triple match, object=http://users.ecs.soton.ac.uk/mc/mcfoaf.rdf#me
triple match, object=http://www.kjetil.kjernsmo.net/foaf#me
triple match, object=http://id.ecs.soton.ac.uk/person/1650
triple match, object=http://dbpedia.org/resource/John_Seely_Brown
triple match, 
object=http://hometown.aol.com/chbussler/foaf/chbussler.foaf#me
triple match, object=http://bblfish.net/people/henry/card#me
triple match, object=http://www.cambridgesemantics.com/people/about/lee
triple match, object=http://heddley.com/edd/foaf.rdf#edd
triple match, object=http://dig.csail.mit.edu/2008/webdav/timbl/foaf.rdf#cm
triple match, object=-6f30c6e0:12d7aaca772:-7fe3
triple match, 
object=http://dig.csail.mit.edu/2007/wiki/people/RobertHoffmann#RMH
no more triple
---------------------------------------------------------

does somebody as the same behavior ?
Greetings,
Fred

> Greetings,
> Olaf
>
>
> On Monday 10 January 2011 20:42:42 Frederic Raimbault wrote:
>> Hi,
>>
>> I'm trying to run the Java example given in section 5.2 of the
>> documentation page
>> http://www4.wiwiss.fu-berlin.de/bizer/ng4j/semwebclient/#using
>>
>> ---------------------------------------------------
>> SemanticWebClient semweb = new SemanticWebClient();
>> //Logger.getLogger("de.fuberlin.wiwiss.ng4j.semwebclient").setLevel(Level.T
>> RACE);
>>
>> String queryString =
>>     "PREFIX foaf:<http://xmlns.com/foaf/0.1/>  " +
>>     "SELECT DISTINCT ?i WHERE {" +
>>        "<http://www.w3.org/People/Berners-Lee/card#i>  foaf:knows ?p . " +
>>        "?p foaf:interest ?i ." +
>>     "}";
>>
>> Query query = QueryFactory.create(queryString);
>> QueryExecution qe = QueryExecutionFactory.create(
>>     query,semweb.asJenaModel("default"));
>> ResultSet results = qe.execSelect();
>>
>> ResultSetFormatter.out(System.out, results, query);
>>
>> //semweb.close();
>> --------------------------------------------------
>>
>> The program terminated but returns :
>> -----
>>
>> | i |
>>
>> =====
>> -----
>>
>> In fact, the simpler query :
>>
>> -------------------------------------------------------------------
>> "PREFIX foaf:<http://xmlns.com/foaf/0.1/>  " +
>> "SELECT DISTINCT ?p WHERE {" +
>> "<http://www.w3.org/People/Berners-Lee/card#i>  foaf:knows ?p . " +
>> "}"
>> -------------------------------------------------------------------
>>
>> doesnt return any triple neither.
>> While tracing the execution with the logger I saw this :
>>
>> -----------------------------------------------------------------
>> Queue result graph:<http://www.w3.org/People/Berners-Lee/card>  (76
>> triples) -----------------------------------------------------------------
>>
>> so I dont understand why there is no match against the triple set
>> retreived from<http://www.w3.org/People/Berners-Lee/card>  ...
>>
>> whats wrong ?
>>
>> (I'm using ng4j-0.9.3 and jena-2.6.2)
>>
>> Greetings,
>
> ------------------------------------------------------------------------------
> Protect Your Site and Customers from Malware Attacks
> Learn about various malware tactics and how to avoid them. Understand
> malware threats, the impact they can have on your business, and how you
> can protect your company and customers by using code signing.
> http://p.sf.net/sfu/oracle-sfdevnl
> _______________________________________________
> ng4j-namedgraphs mailing list
> ng4...@li...
> https://lists.sourceforge.net/lists/listinfo/ng4j-namedgraphs

Re: [namedgraphs] [SWClLib] problem running a simple example

[Olaf H. <ha...@in...>]

Hello Frédéric,

You may try to increase the number of maximal depth of link following a bit. 
To do this you just have to add the following line after the creation of the 
semweb object:

 semweb.getConfig().setValue( SemanticWebClientConfig.MAXSTEPS, "5" );

Please report whether that helped.

Greetings,
Olaf


On Monday 10 January 2011 20:42:42 Frederic Raimbault wrote:
> Hi,
> 
> I'm trying to run the Java example given in section 5.2 of the
> documentation page
> http://www4.wiwiss.fu-berlin.de/bizer/ng4j/semwebclient/#using
> 
> ---------------------------------------------------
> SemanticWebClient semweb = new SemanticWebClient();
> //Logger.getLogger("de.fuberlin.wiwiss.ng4j.semwebclient").setLevel(Level.T
> RACE);
> 
> String queryString =
>    "PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
>    "SELECT DISTINCT ?i WHERE {" +
>       "<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
>       "?p foaf:interest ?i ." +
>    "}";
> 
> Query query = QueryFactory.create(queryString);
> QueryExecution qe = QueryExecutionFactory.create(
>    query,semweb.asJenaModel("default"));
> ResultSet results = qe.execSelect();
> 
> ResultSetFormatter.out(System.out, results, query);
> 
> //semweb.close();
> --------------------------------------------------
> 
> The program terminated but returns :
> -----
> 
> | i |
> 
> =====
> -----
> 
> In fact, the simpler query :
> 
> -------------------------------------------------------------------
> "PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
> "SELECT DISTINCT ?p WHERE {" +
> "<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
> "}"
> -------------------------------------------------------------------
> 
> doesnt return any triple neither.
> While tracing the execution with the logger I saw this :
> 
> -----------------------------------------------------------------
> Queue result graph: <http://www.w3.org/People/Berners-Lee/card> (76
> triples) -----------------------------------------------------------------
> 
> so I dont understand why there is no match against the triple set
> retreived from <http://www.w3.org/People/Berners-Lee/card> ...
> 
> whats wrong ?
> 
> (I'm using ng4j-0.9.3 and jena-2.6.2)
> 
> Greetings,

[namedgraphs] [SWClLib] problem running a simple example

[Frederic R. <fre...@un...>]

Hi,

I'm trying to run the Java example given in section 5.2 of the 
documentation page 
http://www4.wiwiss.fu-berlin.de/bizer/ng4j/semwebclient/#using

---------------------------------------------------
SemanticWebClient semweb = new SemanticWebClient();
//Logger.getLogger("de.fuberlin.wiwiss.ng4j.semwebclient").setLevel(Level.TRACE);

String queryString =
   "PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
   "SELECT DISTINCT ?i WHERE {" +
      "<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
      "?p foaf:interest ?i ." +
   "}";

Query query = QueryFactory.create(queryString);
QueryExecution qe = QueryExecutionFactory.create(
   query,semweb.asJenaModel("default"));
ResultSet results = qe.execSelect();

ResultSetFormatter.out(System.out, results, query);

//semweb.close();
--------------------------------------------------

The program terminated but returns :
-----
| i |
=====
-----

In fact, the simpler query :

-------------------------------------------------------------------
"PREFIX foaf: <http://xmlns.com/foaf/0.1/> " +
"SELECT DISTINCT ?p WHERE {" +
"<http://www.w3.org/People/Berners-Lee/card#i> foaf:knows ?p . " +
"}"
-------------------------------------------------------------------

doesnt return any triple neither.
While tracing the execution with the logger I saw this :

-----------------------------------------------------------------
Queue result graph: <http://www.w3.org/People/Berners-Lee/card> (76 triples)
-----------------------------------------------------------------

so I dont understand why there is no match against the triple set 
retreived from <http://www.w3.org/People/Berners-Lee/card> ...

whats wrong ?

(I'm using ng4j-0.9.3 and jena-2.6.2)

Greetings,
-- 
Frédéric Raimbault

Re: [namedgraphs] Problem with re-directing foaf, rdfs URIs on a simulated Web and using SWCILib for query

[Fahad A. <fal...@gm...>]

Thanks Olaf so much, very useful information.

Regards,
Fahad

Re: [namedgraphs] Problem with re-directing foaf, rdfs URIs on a simulated Web and using SWCILib for query

[Olaf H. <ha...@in...>]

Hey Fahad,

On Thursday 16 December 2010 19:50:14 Fahad Alahmari wrote:
> [...]
> In terms of using SWCILib, how can I avoid the issue of query results
> caching.

SWClLib does not cache query result. The only thing that SWClLib does which 
can be understood as something like caching is that it reuses the queried 
dataset for subsequent queries. This means, it keeps all RDF graphs retrieved 
during the execution of a query and uses these graphs as the seed data for the 
execution of the next query. If you want to start the execution of a query 
with an empty queried dataset, you may use the 'clear' method of the 
'SemanticWebClient' object.

Or are you talking about SQUIN, which, indeed, caches query results? You can 
disable the query result cache in SQUIN by using the configuration option 
squin.servlet.useQueryResultCache - see: 
http://sourceforge.net/apps/mediawiki/squin/index.php?title=Configure_a_SQUIN_service

Greetings,
Olaf

Re: [namedgraphs] Problem with re-directing foaf, rdfs URIs on a simulated Web and using SWCILib for query

[Fahad A. <fal...@gm...>]

Hi Olaf,

Thank you so much. I got it working properly.  foaf:Document needs to be
pointed specifically to the vocabulary in the local file. e.g:

foaf:Document rdfs:seeAlso <http://localhost:8080/newspaper/vocabulary/news
/sports>
foaf:Document rdfs:seeAlso <http://localhost:8080/newspaper/vocabulary/news/
national>
....

In terms of using SWCILib, how can I avoid the issue of query results
caching.

Thanks again for help

Regards,
Fahad