John McDowall, picking up the riff on the death of SOAP, says:

I am not sure REST or SOAP address these issues. A well documented schema and a well written HTML page probably contribute more to message integration than any WSDL or REST URI

From Fast Takes: Is it the message or the transport
Referenced Mon Mar 28 2005 07:53:38 GMT-0700 (MST)

In other words, conveying meaning trumps protocol as a priority for interoperability.