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Resource Description Framework (RDF) databases are engines that standardize on the SPARQL query language. These databases require a query language more advanced than SQL so as to make possible the semantic querying of data to bring the world closer to the concept of the semantic web. SPARQL is not only efficient in semantic queries, but also in interfacing with the data. RDF databases can do set processing and at the same time do graph processing.
RDF databases function on the concept of formulating statements concerning resources, especially web, resources as subject-predicate-object expressions. These expressions are called triples in RDF nomenclature. The subject signifies the resource, and the predicate signifies traits of the resource and defines a relationship between the object and the subject.
RDF databases are a NoSQL solution built on a uniform and simple data model. NoSQL is a loosely defined database model that is non-relational, open source and scalable horizontally. RDF databases provide various advantages consisting of data portability, being future proof and not requiring product lock-in.