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How do SOAP and REST relate?
SOAP is a protocol, and REST is an architectural style. The SOAP specification - at least versions 1.1 and 1.2 - do not prescribe which architectural style to use, so can can be used within the constraints of REST, or not. Prior to SOAP 1.1 though, SOAP could not be used RESTfully, because SOAP faults were sent using the HTTP success code (200). Practically everything that SOAP is used for today is not RESTful.