RDF.XML.Encoder.stream

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

stream(data, opts \\ [])

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Specs

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

Encodes the given RDF data structure to a RDF/XML stream.

By default the RDF/XML stream will emit single line strings for each of the descriptions in the given data. But you can also receive the serialized RDF/XML description as IO lists aka iodata by setting the :mode option to :iodata.

For a description of the other available options see the module documentation.