Triplestores are a form of database used to store semantic web data. RDF is encoded as subject-predicate-object triples and the triplestore stores and indexes these triples in order to make them easy to query and process. Often SPARQL is used to query a triplestore. The quadstore is an extension of the triplestore to store multiple graphs, that is collections of triples with a common origin or use.
Used in Chap. 17: pages 253, 254, 266
Used in glossary entries: database, RDF, semantic web, SPARQL, subject--predicate--object triples