Before revision:  Moreover, we also present a proof-of-concept implementation of our approach, demonstrate its validity and applicability by executing SPARQL queries on top of leading Graph stores ( Neo4J, Sparksee, and Apache TinkerGraph ) and compare their performances with RDF stores (Openlink Virtuoso, 4Store , and JenaTDB). The results indicate that, for complex queries (such as Star-shaped), Gremlin pattern matching traversals out-perform their corresponding SPARQL queries significantly, including their translation time. Gremlinator currently covers a subset of the SPARQL 1.0 specification, specifically the SELECT queries.
After revision:  Moreover, we also present a proof-of-concept implementation of our approach, demonstrate its validity and applicability by executing SPARQL queries on top of leading Graph stores ( Neo4J, Sparksee, and Apache TinkerGraph ) and compare their performances with RDF stores (Openlink Virtuoso, 4Store and JenaTDB. Our evaluation demonstrates the substantial performance gain obtained by the Gremlin counterparts of the SPARQL 1.0 specification, specifically the SELECT queries.