The Protocol versus Document Points of View in Computer Protocols

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Network Working Group                                    D. Eastlake 3rd
Request for Comments: 3930                         Motorola Laboratories
Category: Informational                                     October 2004



   The Protocol versus Document Points of View in Computer Protocols

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   This document contrasts two points of view: the "document" point of
   view, where digital objects of interest are like pieces of paper
   written and viewed by people, and the "protocol" point of view where
   objects of interest are composite dynamic network messages.  Although
   each point of view has a place, adherence to a document point of view
   can be damaging to protocol design.  By understanding both points of
   view, conflicts between them may be clarified and reduced.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Points of View . . . . . . . . . . . . . . . . . . . . . . . .  2
       2.1.  The Basic Points of View . . . . . . . . . . . . . . . .  3
       2.2.  Questions of Meaning . . . . . . . . . . . . . . . . . .  3
             2.2.1.  Core Meaning . . . . . . . . . . . . . . . . . .  3
             2.2.2.  Adjunct Meaning. . . . . . . . . . . . . . . . .  4
       2.3.  Processing Models. . . . . . . . . . . . . . . . . . . .  5
             2.3.1.  Amount of Processing . . . . . . . . . . . . . .  5
             2.3.2.  Granularity of Processing. . . . . . . . . . . .  5
             2.3.3.  Extensibility of Processing. . . . . . . . . . .  6
       2.4.  Security and Canonicalization. . . . . . . . . . . . . .  6
             2.4.1.  Canonicalization . . . . . . . . . . . . . . . .  6
             2.4.2.  Digital Authentication . . . . . . . . . . . . .  8
             2.4.3.  Canonicalization and Digital Authentication. . .  8
             2.4.4.  Encryption . . . . . . . . . . . . . . . . . . .  9
       2.5.  Unique Internal Labels . . . . . . . . . . . . . . . . . 10
   3.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
   4.  Resolution of the Points of View . . . . . . . . . . . . . . . 11



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