An optional field indicating if the given quad stream originates from a triple-based serialization,
in which everything is serialized in the default graph.
If falsy, the quad stream contain actual quads, otherwise they should be interpreted as triples.
An optional field indicating if the given quad stream originates from a triple-based serialization, in which everything is serialized in the default graph. If falsy, the quad stream contain actual quads, otherwise they should be interpreted as triples.