(2003-08-31) Dumbill Rdf Quad

Edd Dumbill on (from Jul'03) aggregating RDF from multiple sources, and the need to track Context/provenance (via quads). In working with this idea, I've called the fourth element of the quad above a context. This is by no means a canonical term, but it works well for me. Furthermore, the same term is used in the RedLand RDF application framework, which I'm going to use to demonstrate an application of this provenance tracking.