RDF.Graph.set_base_iri

You're seeing just the function set_base_iri, go back to RDF.Graph module for more information.
Link to this function

set_base_iri(graph, base_iri)

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Specs

set_base_iri(t(), RDF.IRI.t() | nil) :: t()

Sets the base IRI of the given graph.

The base_iri can be given as anything accepted by RDF.IRI.coerce_base/1.