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(* Title: HOL/IOA/ABP/Impl.thy
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ID: $Id$
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Author: Tobias Nipkow & Konrad Slind
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Copyright 1994 TU Muenchen
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The environment
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*)
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Env = IOA + Action +
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types
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'm env_state = "bool"
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(* give next bit to system *)
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consts
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env_asig :: "'m action signature"
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env_trans :: "('m action, 'm env_state)transition set"
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env_ioa :: "('m action, 'm env_state)ioa"
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next :: "'m env_state => bool"
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defs
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env_asig_def
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"env_asig == ({Next}, \
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\ UN m. {S_msg(m)}, \
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\ {})"
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env_trans_def "env_trans == \
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\ {tr. let s = fst(tr); \
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\ t = snd(snd(tr)) \
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\ in case fst(snd(tr)) \
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\ of \
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\ Next => t=True | \
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\ S_msg(m) => s=True & t=False | \
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\ R_msg(m) => False | \
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\ S_pkt(pkt) => False | \
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\ R_pkt(pkt) => False | \
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\ S_ack(b) => False | \
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\ R_ack(b) => False}"
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env_ioa_def "env_ioa == \
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\ (env_asig, {True}, env_trans)"
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end
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