RDF.Dataset.add

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

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

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Specs

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

Adds triples and quads to a RDF.Dataset.

The triples can be provided in any form accepted by add/2.

The graph option allows to set a different destination graph to which the statements should be added, ignoring the graph context of given quads or the name of given graphs in input.

Note: When the statements to be added are given as another RDF.Dataset and a destination graph is set with the graph option, the descriptions of the subjects in the different graphs are aggregated.