RDF.Graph.add

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

add(graph, input, opts \\ [])

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Specs

add(t(), input(), keyword()) :: t()

Adds triples to a RDF.Graph.

The input can be provided

When the statements to be added are given as another RDF.Graph, the graph name must not match graph name of the graph to which the statements are added. As opposed to that, RDF.Data.merge/2 will produce a RDF.Dataset containing both graphs.

Also when the statements to be added are given as another RDF.Graph, the prefixes of this graph will be added. In case of conflicting prefix mappings the original prefix from graph will be kept.