Comments on draft-451-new-protocol-elements-01

   -  HTTP status code 451 is increasingly being used to deny access to
      resources based on geographical IP.  The scope of this denial is
      sometimes as finely scoped as a city or a province.  The response
      SHOULD contain a provisional header with geographical scope of
      block.

This seems rather underspecified. What format should this information
be in? I'm not an expert on this kind of thing, but perhaps you want
https://tools.ietf.org/html/rfc5139

-Ekr