RDF.Graph.delete

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

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

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Specs

delete(t(), input(), keyword()) :: t()

Deletes statements from a RDF.Graph.

Note: When the statements to be deleted are given as another RDF.Graph, the graph name must not match graph name of the graph from which the statements are deleted. If you want to delete only graphs with matching names, you can use RDF.Data.delete/2.