Support of GeoSPARQL about rsp4j HOT 4 OPEN

The second link does not lead to the right destination.

But I think with your indications that you wanted to talk about this article and this branch:

• http://ceur-ws.org/Vol-1870/paper-02.pdf
• https://github.com/adejonghe/CSPARQL-engine/tree/c-geosparql

I will try to look at this issue, once I have a proper work environment.

from rsp4j.

Hi,

Indeed C-SPARQL2.0 uses Jena, so you could extend it for GeoSPARQL queries. A few years back, a colleague of mine extended the CSPARQL1.0 engine for geosparql support, perhapse you can find some clues in his paper.

Don't hesitate to send a pull request when you were able to do the extension. At this moment I don't have the bandwidth to implement it myself, but I can review the code.

KR,
Pieter

from rsp4j.

I have been looking more closely at the implementation of this feature by following the work of your colleague, and I have to say that it is not so straightforward. CSPARQL's sources have changed a lot between the new version and the first one, and he was actually replacing JENA's engine with the Parliament engine (version 2.7.10 at the time).

https://github.com/SemWebCentral/parliament/tree/master

from rsp4j.

Hi,

I think you can create a version with parliament by updating this class: https://github.com/streamreasoning/rsp4j/blob/master/csparql2/src/main/java/org/streamreasoning/rsp4j/csparql2/engine/JenaContinuousQueryExecution.java
This is where the data is retrieved from the window operators and added to Jena. I think you can do the same thing but provide thee data to Parliament instead.

However, I think it is easier to include the Jena extension for GeoSPARQL (jena-geosparql), then not too much needs to be changed I would think.

from rsp4j.