Figure 8

Asynchronous Response Message. This is the full HTTP message sent in response to the invocation message from Figure 3, as it would appear if the Hello service were implemented asynchronously. It is an RDF/XML instance of the Hello service's output class - GreetedIndividual, but unlike the response message in Figure 4, the output data is not yet attached. Rather, the input URI is now decorated with the "isDefinedBy" predicate from the RDF-Schema standard vocabulary. The value of that predicate is a URL which can be polled by the client until the data is ready. The response message carries the HTTP Header standard response code of 202 "Accepted but incomplete".