code: def _get_response_body_mime_type(self):
          
          mime_type = self._get_response_mime_type()
          if mime_type is AtomMime:
              # FIXME: This cements using XML as the representation to use in
              #        ATOM bodies (which is perhaps not too worrisome).
              mime_type = XmlMime
          return mime_type
docs: Returns the response body MIME type. This might differ from the
          overall response mime type e.g. in ATOM responses where the body
          MIME type is XML.