Github user ajs6f commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/26
Generally, looks good to me. The questions I have are:
1. Do we need to talk about `equals` and `hasCode` separately?
2. Can we clarify the definition of "immutable" a bit: most people, I
think, would assume that it means that e.g. `Quad::getSubject` is actually
going to return the identical object, not an `equals` object. I'm not against
the definition you are using here, and I can understand how it might give a
useful flexibility during implementation, but it might be nice to have a
higher-level note explaining it carefully.
3. I think there could be a use of `default` methods here.
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