1(*  Title:      HOL/HOLCF/IOA/ABP/Action.thy
2    Author:     Olaf M��ller
3*)
4
5section \<open>The set of all actions of the system\<close>
6
7theory Action
8imports Packet
9begin
10
11datatype 'm action =
12    Next | S_msg 'm | R_msg 'm
13  | S_pkt "'m packet" | R_pkt "'m packet"
14  | S_ack bool | R_ack bool
15
16end
17