Sail is an RDF triple/quad store interface developed by OpenRDF. Any database the implements the Sail interfaces properly is a valid RDF triple/quad store. A graph database is a great way to build a triple/quad store because its possible to mix indexing and graph traversals to solve the RDF “pattern match” problem.
N. Kouagou, S. Heindorf, C. Demir, and A. Ngomo. NeSy 2023, 17th International Workshop on Neural-Symbolic Learning and Reasoning, Certosa di Pontignano, Siena,
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Conference (ISWC 2002), 2342, page 54--68. Sardinia, Italy, Springer Verlag, Heidelberg Germany, (June 2002)See also http://www.openrdf.org/.