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Neptune supports SPARQL via the SPARQL 1.1 w3c specification. As noted here: https://docs.aws.amazon.com/neptune/latest/userguide/feature-sparql-compliance.html
What you're referring to above is not part of the SPARQL 1.1 specification and is something custom within Stardog: https://www.stardog.com/blog/a-path-of-our-own/
Path finding queries are generally easier to express in the Property Graph query languages (Gremlin and openCypher):
- https://www.kelvinlawrence.net/book/PracticalGremlin.html#sp
- https://s3.amazonaws.com/artifacts.opencypher.org/openCypher9.pdf
If you're use case's primary function requires path finding, then we generally recommend to use Neptune to host a Property Graph instead of an RDF graph.
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Thankyou for providing information.