Github user afs commented on the issue: https://github.com/apache/commons-rdf/pull/32 I haven't looked at the code in enough detail but I was assuming there would be one place with two functions: Quad->JenaQuad and JenaQuad->Quad. This would the strategy (policy) for all of the adapter. That is what I mean by the boundary. "urn:x-arq:DefaultGraph" only exists in Jena. Quad has `Optional.empty()` `Optional.empty()` => `urn:x-arq:DefaultGraph` Jena `Quad.isDefaultGraph` => `Optional.empty()` `Quad.equals` works, which is very important. or maybe I've been doing too much policy abstraction recently.
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