James Kempf: 1) Section 5.3.1, last paragraph - Is there a reference for the definition
of how to calculate the timestamp? If so, it would be good to put it in.

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Jari Arkko: I don't have a reference, but the style is similar
to the time values used under Unix. I added this note:

       Implementation note: This format is compatible with the usual
       representation of time under UNIX, although the number of
       bits available for the integer and fraction parts may vary.

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