RDF.Serialization.Encoder.stream

You're seeing just the callback stream, go back to RDF.Serialization.Encoder module for more information.
Link to this callback

stream(arg1, keyword)

View Source (optional)

Specs

stream(RDF.Data.t(), keyword()) :: Enumerable.t()

Serializes a RDF data structure into a stream.

It should return a stream emitting either strings or iodata of the serialized RDF data structure. If both forms are supported the form should be configurable via the :mode option and its values :string respective :iodata.