Transport of the information: binding to a transport protocol
  - The XMLP envelope needs to be sent from one point (XMLP processor) to
    another.
 
  - Job is done by an underlying protocol.
 
  - Protocol binding: give information to an underlying protocol (BEEP,
    SMTP, ...) about what to do with a message.
 
  - The Working Group will design a normative binding to HTTP.
 
