Github user stain commented on the issue:
https://github.com/apache/incubator-commonsrdf/pull/19
Moving forward with quads! I have taken a stance.
Rather than `TripleOrQuad` I propose a similar interface, called
[TripleLike](http://stain.github.io/incubator-commonsrdf/quad/org/apache/commons/rdf/api/TripleLike.html).
This can also support generalized RDF statements with any `RDFTerm` subtype
for `getSubject()`, `getPredicate()` and `getObject()`. This can be useful both
for parsers and for SPARQL compatibility.
Then naturally we also have its extension
[QuadLike](http://stain.github.io/incubator-commonsrdf/quad/org/apache/commons/rdf/api/QuadLike.html)
which adds a generalized `getGraphName`.
Instead of `DatasetOrGraph` I propose a generalized
[GraphLike](http://stain.github.io/incubator-commonsrdf/quad/org/apache/commons/rdf/api/GraphLike.html)
that contains `TripleLike` statements. `GraphLike` do not have the split-up
methods for subject/predicate/object - thus `Quad` does not need to support the
ambiguous `contains(s,p,o)`.
As `Graph` and `Dataset` previously differed in returning the stream by
`getTriples()` and `getQuads()` and this crucial method therefore could not be
in the common interface, I've gone brave here and renamed both to
[.stream()](http://stain.github.io/incubator-commonsrdf/quad/org/apache/commons/rdf/api/Graph.html#stream--).
What do you think?
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