  Knowledge graphs have become popular over the past decade and frequently rely
on the Resource Description Framework (RDF) or Property Graph (PG) databases as
data models. However, the query languages for these two data models -- SPARQL
for RDF and the PG traversal language Gremlin -- are lacking interoperability.
We present Gremlinator, the first translator from SPARQL -- the W3C
standardized language for RDF -- and Gremlin -- a popular property graph
traversal language. Gremlinator translates SPARQL queries to Gremlin path
traversals for executing graph pattern matching queries over graph databases.
This allows a user, who is well versed in SPARQL, to access and query a wide
variety of Graph Data Management Systems (DMSs) avoiding the steep learning
curve for adapting to a new Graph Query Language (GQL). Gremlin is a graph
computing system-agnostic traversal language (covering both OLTP graph database
or OLAP graph processors), making it a desirable choice for supporting
interoperability for querying Graph DMSs. Gremlinator currently supports the
translation of a subset of SPARQL 1.0, specifically the SPARQL SELECT queries.
