RDF.Graph.add_prefixes

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

add_prefixes(graph, prefixes, conflict_resolver \\ nil)

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Specs

add_prefixes(
  t(),
  RDF.PrefixMap.t() | map() | keyword() | nil,
  RDF.PrefixMap.conflict_resolver() | nil
) :: t()

Adds prefixes to the given graph.

The prefixes mappings can be given as any structure convertible to a RDF.PrefixMap.

When a prefix with another mapping already exists it will be overwritten with the new one. This behaviour can be customized by providing a conflict_resolver function. See RDF.PrefixMap.merge/3 for more on that.