def _get_response_body_mime_type(self):
        """
        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.
        """
        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
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.