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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