oduced, and the
      specification was converted to RFC style.

<span class="h2"><a class="selflink" name="section-2" href="#section-2">2</a>. Detailed specification</span>

   2.1. Overall conventions

      In the diagrams below, a box like this:

         +---+
         |   | &lt;-- the vertical bars might be missing
         +---+




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