This project contains an API to run SPARQL queries over a relational database made over Ontop.
To run this API you need 2 files:
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An OWL/XML file, describing the ontology schema;
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A mapping file, describing how the elements from the ontology schema can be retrieved from SQL queries. This file has to follow Ontop syntax.
A simple use example can be found at App.java.
You can implement your own RoR API. Just implement the RoR interface to your own framework.