Re: Protocol Definition
Joe Touch <touch@isi.edu> Mon, 18 June 2012 22:44 UTC
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Date: Mon, 18 Jun 2012 15:44:25 -0700
From: Joe Touch <touch@isi.edu>
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To: Alessandro Vesely <vesely@tana.it>
Subject: Re: Protocol Definition
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On 6/18/2012 3:30 AM, Alessandro Vesely wrote: ... > I noticed no disagreement between "method" and "mechanism", at the > time. In retrospect, those two terms might seem to allude to a > different depth of semantic explanations. Rereading that thread, I > find that the same ambiguity holds for algorithm descriptions: one > can give a full description (or coding) of, say, sqrt, without > actually saying that the square of the result will match its argument > up to some rounding error. The specification does not have to relate > the underlying mathematical abstraction. This is the difference between a behavioral description and a procedural description. Behavioral treats a system as a "black box", and defines the system as a function and how it transforms its input into its output. Procedural specifies the particular steps taken inside the box. Procedural is more specific than behavioral: behavioral = any of a number of ways of calculating SQRT procedural = one specific algorithm for calculating SQRT Semantics is a completely different thing - the assignment of "meaning" to symbols. Neither procedural nor behavioral descriptions need to include semantic descriptions. > Protocol specifications, especially when dealing with policies, do not > have to describe the exact meaning of the relevant tokens. To do that > would often look like mandating a state or a reaction, neither of > which is needed to ensure interoperability. In a protocol, state transitions and response messages are specified. Protocols are typically described procedurally, FWIW. > In fact, the protocol > just has to ensure that a policy can be transmitted correctly. Many > would rather leave a policy token underspecified than get involved in > its details. This is like claiming that a protocol is just "bits on the wire", and it is not accurate. > In that respect, a protocol is not a complete method. The "upper > layer", where policies and politics are dealt with, seems to be too > fuzzy to be specified. I think this limitation is consistent with the > etymological meaning of the term, that refers to forms of conduct that > don't betray intentions. Is that right? Conduct, intention, and semantics refer to human interpretations of events. Unless a human is part of your protocol stack, they're not relevant. I agree with AB - these issues aren't relevant to IETF descriptions of protocols. Joe
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- Re: Protocol Definition pankaj kumar
- Re: Protocol Definition Dave CROCKER
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- RE: Protocol Definition Yaakov Stein
- RE: Protocol Definition John Day
- Re: Protocol Definition Joe Touch
- Re: Protocol Definition Alessandro Vesely
- Re: Protocol Definition Abdussalam Baryun
- Re: Protocol Definition Joe Touch
- Re: Protocol Definition Alessandro Vesely
- Re: Protocol Definition Abdussalam Baryun
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