If one wants to deal with multiple and/or different RDF Graphs one needs an Identifier that says which kind of Graph one has to access. So one ends up in a Quadruple Store where one also has an Identifier everywhere that states that a certain Triple belongs to a specific Graph. In such one has some provenance information that is given in a Quadruple Store.
A Quad Table is a single table that has Subject, Property and Object as well as Graph in it.
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