The Universal Pantograph Representation is the essence of networking

… on RDF vs. Topic Maps (summarizing Michael Sperberg-McQueen). Let me extract and sharpen a bit. In topic maps:

• You know the name of every object. This is human-oriented,
  practical semantics…
• You know which objects are information resources and which are
  not. …
• You know which objects are n-ary relations and which are not.*…
• You know the context of each statement. …

Wait a minute. You mean all semantic web solutions don’t tell you those things? Why on earth not?

NOTE * The distinction is important enough to have merited at least
one W3C note.