How to use the extended SPARQL constructs

[szarnyasg]

Hi,

I managed to get Corese working with basic SPARQL queries. I have a couple of questions about the extended SPARQL language:

1. I'd like to use the param[...] construct described in the paper Analysis of a Real Online Social Network Using Semantic Web Frameworks. Does this work in the current version of Corese? Or do I have to "simulate" this by generating the queries for all parameters?

2. I've found group by any queries in the tests (1, 2), but I couldn't get it working:

   PREFIX base: <http://www.semanticweb.org/ontologies/2015/trainbenchmark#> 
   select ?x ?y 
   where {
     ?x base:follows ?y
   }
   group by any
   

   This throws an exception:

   ERROR 2015-12-05 19:44:47,855 [562367320@qtp-354432491-19] (SPARQLRestAPI.java:398) - Error while querying the remote KGRAM engine
   

   (Without the group by any line, it's fine).

3. Is there a more up-to-date version of this documentation somewhere?

Thanks,
Gabor

[ocorby]

Hi,

Unfortunately these features are not available anymore.

There is a new way to perform these types of computing. It consists in
associating a plugin to the SPARQL interpreter in such a way that :
each time a solution of the query is found or a property path is
identified, a plugin callback function is called in order to perform
specific processing, e.g. network analysis operation.

The plugin must implement the ResultListener interface
(fr.inria.edelweiss.kgram.event ; kgram project)

The main functions to be implemented are :

public boolean process(Path path)

public boolean process(Environment env)

Best regards

Olivier Corby

[szarnyasg]

Thanks, I'll look into the Java API.