RDF.Graph.delete_descriptions

You're seeing just the function delete_descriptions, go back to RDF.Graph module for more information.
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delete_descriptions(graph, subjects, opts \\ [])

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Specs

Deletes all statements with the given subjects.

If subjects contains subjects that are not in graph, they're simply ignored.

The optional :delete_annotations keyword option allows to set which of RDF-star annotations of the deleted statements should be deleted. Any of the possible values of delete_annotations/3 can be provided here. By default no annotations of the deleted statements will be removed. Alternatively, the :add_annotations, :put_annotations or :put_annotation_properties keyword options can be used to add annotations about the deleted statements with the addition semantics similar to the respective add_annotations/3, put_annotations/3 and put_annotation_properties/3 counterparts.