Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/23
So I guess they would be mainly to represent the "triple patterns" in
SPARQL, e.g. `?s` in:
```turtle
?s a <http://example.com/>;
```
although there would not be any way to use those jena variables with the
Commons RDF-exposed graph/datasets - and they should not be returned in there.
(unless someone had deliberately added such to a Jena `Graph` manually - which
is allowed today as it excepts any `Node`)
Do I get it right that these would not be appearing in query *results*?
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