RDF.Graph.query

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

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Execute the given query against the given graph.

This is just a convenience delegator function to RDF.Query.execute!/3 with the first two arguments swapped so it can be used in a pipeline on a RDF.Graph.

See RDF.Query.execute/3 and RDF.Query.execute!/3 for more information and examples.