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An Algebraic Specification of HDLC Procedures and Its Verification

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5 Author(s)
Teruo Higashino ; Department of Information and Computer Sciences, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka, 560, Japan. ; Masaaki Mori ; Yuji Sugiyama ; Kenichi Taniguchi
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It is well known that algebraic specification methods are promising for specifying programs and for verifying their various properties formally. In this paper, an algebraic specification of information transfer procedures of high-level data link control (HDLC) procedures is presented and some of the main properties of the specification are shown. First, we introduce abstract states, state transition functions, and output functions corresponding to elementary notions extracted from the description of HDLC procedures in ISO 3309-1979 (E) and ISO 4335-1979 (E). Second, we show axioms which represent the relations between the values of functions before and after the state transitions. Then, it is proved that the specification is ``consistent,'' ``sufficiently complete,'' and ``nonredundant.'' Also it is shown that an implementation which realizes the specification is naturally derived. In the last section, verification of various properties of HDLC procedures is formulated in the same framework as the algebraic specification, and some verification examples are presented.

Published in:

IEEE Transactions on Software Engineering  (Volume:SE-10 ,  Issue: 6 )