diff -r 722bf1319be5 -r fd1be45b64bf IOA/example/Channels.thy
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IOA/example/Channels.thy	Wed Nov 02 11:50:09 1994 +0100
@@ -0,0 +1,61 @@
+Channels = IOA + Action + Multiset + "Lemmas" + Packet +
+
+consts
+
+srch_asig, 
+rsch_asig  :: "'m action signature"
+
+srch_trans :: "('m action, 'm packet multiset)transition set"
+rsch_trans :: "('m action, bool multiset)transition set"
+
+srch_ioa   :: "('m action, 'm packet multiset)ioa"
+rsch_ioa   :: "('m action, bool multiset)ioa"
+
+rules
+
+srch_asig_def "srch_asig == <UN pkt. {S_pkt(pkt)},    \
+\                            UN pkt. {R_pkt(pkt)},    \
+\                            {}>"
+
+rsch_asig_def "rsch_asig == <UN b. {S_ack(b)}, \
+\                            UN b. {R_ack(b)}, \
+\                            {}>"
+
+srch_trans_def "srch_trans ==                                          \
+\ {tr. let s = fst(tr);                                                \
+\          t = snd(snd(tr))                                            \
+\      in                                                              \
+\      case fst(snd(tr))                                               \
+\        of S_msg(m) => False |                                        \
+\           R_msg(m) => False |                                        \
+\           S_pkt(pkt) => t = addm(s, pkt) |                        \
+\           R_pkt(pkt) => count(s, pkt) ~= 0 & t = delm(s, pkt) |   \
+\           S_ack(b) => False |                                     \
+\           R_ack(b) => False |                                     \
+\           C_m_s => False |                                           \
+\           C_m_r => False |                                           \
+\           C_r_s => False |                                           \
+\           C_r_r(m) => False}"
+
+rsch_trans_def "rsch_trans ==                            \
+\ {tr. let s = fst(tr);                                  \
+\          t = snd(snd(tr))                              \
+\      in                                                \
+\      case fst(snd(tr))                                 \
+\      of                                                \
+\      S_msg(m) => False |                               \
+\      R_msg(m) => False |                               \
+\      S_pkt(pkt) => False |                          \
+\      R_pkt(pkt) => False |                          \
+\      S_ack(b) => t = addm(s,b) |                    \
+\      R_ack(b) => count(s,b) ~= 0 & t = delm(s,b) |  \
+\      C_m_s => False |                                  \
+\      C_m_r => False |                                  \
+\      C_r_s => False |                                  \
+\      C_r_r(m) => False}"
+
+
+srch_ioa_def "srch_ioa == <srch_asig, {{|}}, srch_trans>"
+rsch_ioa_def "rsch_ioa == <rsch_asig, {{|}}, rsch_trans>"
+
+end