Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/26
This clarifies immutability of an `RDFTerm` (as it is already implemented)
and that it can be safely used in say a `Set`.
I added `.equals()` and `.hashCode()` to `RDFTerm` which delegate to `IRI`,
`BlankNode` and `Literal`.
One questions is if `RDFTerm` class should be restrictive about its
children being either an `IRI`, `BlankNode` or `Literal` - which would not
allow like `Variable` we tried in Jena - or multiple inheritance.
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