Synchronous Response Message. This is the full HTTP message sent in response to the invocation message from Figure 3. It is an RDF/XML instance of the Hello service's output class - GreetedIndividual. As per that class definition, the instance carries a "greeting" predicate, with the value "Hello, Guy Incognito!". Note that the URI of the GreetedIndividual is identical to the URI of the NamedIndividual input, as per the SADI best-practices.