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Why RDF store is not included in the types of NoSQL databases

After reading some articles about NoSQL databases, I found that there are 4 types of NoSQL databases and for every type there are NoSQL databases.

I understood that NoSQL is Not Only SQL; it means every database that use other query language, but I am confusing why RDF stores are not with this selection of these types (Key/value, Document, Column and Graph).

Solution

  • RDF stores can be considered as a subclass of graph databases:

    1. The central RDF 1.1 notion is RDF graph.

    2. Many triplestores have word 'graph' in their names: , ,
      (some of them are not only RDF stores though).

    Obviously, there are differences between the RDF model and other graph database models. These differences are described e.g. in An introduction to Graph Data Management by Renzo Angles and Claudio Gutierrez.

    See also Reification is red herring by Bob DuCharme.