Github user afs commented on the issue:
https://github.com/apache/jena/pull/274
Here, the design should align with `Quad`.
What's wrong with special names _for graphs_ anyway? There are 3 special
names already, and it's an extensible approach for other names - semantic
web/linked data is about naming things.
`Optional` is for a different situation, null means absent or unknown, not
"different".
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