refined antiquotation interface: formally pass result context and (potential) result source;
removed redundant raw_antiquotation;
(*  Title:      HOLCF/IOA/ABP/Packet.thy
    ID:         $Id$
    Author:     Olaf Müller
*)
header {* Packets *}
theory Packet
imports Main
begin
types
  'msg packet = "bool * 'msg"
definition
  hdr :: "'msg packet => bool" where
  "hdr = fst"
definition
  msg :: "'msg packet => 'msg" where
  "msg = snd"
end