[zeromq-dev] "MAY NOT" in RFCs

[Robert Kern]

The Titanic Service Protocol has this line: "Implementations MAY NOT use status 
codes that are not defined here:".

   http://rfc.zeromq.org/spec:9

However, "MAY NOT" is not one of the key words defined in RFC 2119:

   http://tools.ietf.org/html/rfc2119

Did the author intend this to be "MUST NOT" or "SHOULD NOT"?

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco