What a <time> element represents

Currently the spec says:

  The time element represents a precise date and/or a time in the
  proleptic Gregorian calendar.

but it should probably say something like:

  The time element represents a time, a date or a precise moment in time
  with an associated time zone offset.


Also, I think mentions of time zones in this section should be replaced
with mentions of time zone offsets.

-- 
Cameron McCormack ≝ http://mcc.id.au/