Amazon Neptune
User Guide (API Version 2017-11-29)

Specifying a Named Graph for Load

Amazon Neptune associates every triple with a named graph. If you don't specify a named graph when loading, inserting, or updating triples, Neptune uses the fallback named graph defined by the URI https://aws.amazon.com/neptune/vocab/v01/DefaultNamedGraph.

You can specify the named graph to use for all triples (or quads with the fourth position blank) by using the parserConfiguration: namedGraphUri parameter. For information about the Load command syntax, see Neptune Loader Command.