Stephen Downes

This document "introduces the basic concepts of RDF and shows concrete examples of the use of RDF." It's background for the introduction of RDF 1.2 (also known as 'RDF Star'), an important update to the W3C specification. This summary on LinkedIn (sorry) describes the key changes well. "The headline feature is 'triple terms': the culmination of the long-running RDF-star effort. In plain terms: you can now use an RDF triple itself as the object of another triple. Statements about statements, without the old reification gymnastics that everyone quietly hated. Hypergraphs in disguise." In simple terms: if 'P' is the statement that 'Cats like catnip', then now it's much easier to say 'Mary believes P'. This enables a much deeper and expressive semantics. More detail in this presentation.