Access Ontop end point with Twinkle

Ontop can be used as SPARQL end-point by running Sesame Workbench. The ways to run Ontop as SPARQL end-point are remarked here. Accessing Ontop end-point with Twinkle SPARQL Query tool is explained as following:

1. First of all we need to add a new repository to Sesame Workbench.

   • Repositories -> New Repository

   • Give a name and id to the new repository.

     

   • Add the ontology and the mapping file to repository.

     

     Then we can see the new repository on the repository list.

     

2. At the second step;

• download Twinkle from here and add Ontop end-point as a remote service to etc/config.n3 file.

<http://localhost:8080/openrdf-sesame/repositories/1> a sources:Endpoint
        ; rdfs:label "Ontop end-point".
   

After adding Ontop end-point we can see it at the Remote Services list.

  [[attachments/AccessOntopWithTwinkle/twinkle-1.png]]

• Click the Ontop end-point item on the Remote Services list. Now we are ready to test it with the following query:

  PREFIX : <http://meraka/moss/exampleBooks.owl#> 
  

SELECT ?x ?y ?name WHERE {?x a :Book; :title ?y; :writtenBy ?z. ?z :name ?name.}