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I'm using D2RQ to map relational database to an RDF format. Everything works fine except when I want to do a federated search from another endpoint I'm seeing this in a log file:

Query execution error: com.hp.hpl.jena.sparql.ARQNotImplemented: OpNull

Is it possible to do a federated queries in D2RQ ver 0.8.1?

Thank you

Stanislav Kralin
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marko3d
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  • D2RQ is based on old jena (2.x), that does not fully support SPARQL 1.1 - this may be a cause of that exception. There is now [ONT-D2RQ](https://github.com/avicomp/ont-d2rq), which is for up2date jena. But: no server yet. – ssz Nov 12 '18 at 19:46
  • a simple fuseki server is added – ssz Jan 12 '19 at 20:33

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