Github user afs commented on the issue:
https://github.com/apache/commons-rdf/pull/32
`defaultGraph` is explicit name of the default graph in Jena,
`defaultGraphNode` is for when the system is generating it, not for data.
There are methods for "is this the default graph?" that abstract away from this
detail.
The mark in the graph slot of the quad is anything to distinguish it - Jena
uses a URI although it is not properly "U"niversal - it is relative is the
dataset. A quad is a triple from a graph in a dataset. Triples are universal.
I guess I don't see the issue here: why is it not "Commons RDF marker for
Quad/dft graph" <=> "System X marker for Quad/dft graph" at the adapter
boundary.
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