“This has obviously not happened. Anyone that has to write against web services like Amazon, Facebook or Flickr knows a lot of trial and error is needed to make anything work, at least thats been my experience trying to use their REST api. Alan proposed creating a “universal interface language” to exchange this information, which sounds a little like WSDL, but what about automatic discovery of services? I haven’t found a protocol for REST introspection like there is for XML-RPC.” source...