RFC3996-Internet Printing Protocol (IPP): The ippget Delivery Method for Event Notifications

   The Printer MUST NOT return Notification Events with lower sequence
   numbers for the corresponding Subscription object.  Therefore, by
   supplying the proper values for this attribute the Notification
   Recipient can prevent getting the same Event Notifications from a
   Subscription object that were returned on a previous Get-
   Notifications request.  The Notification Recipient SHOULD remember
   the highest "notify-sequence-number" value returned for each
   Subscription object requested and SHOULD pass that value for each
   requested Subscription object on the next Get-Notifications request.

   If the Notification Recipient supplies fewer values for this
   attribute (including omitting this attribute) than it does for the
   "notify-subscription-ids" operation attribute, the Printer assumes a
   '1' value for each missing value.  A value of '1' causes the Printer
   to return any un-expired Event Notification for that Subscription
   object, as '1' is the lowest possible sequence number.  If the
   Notification Recipient supplies more values for this attribute than
   the number of values for the "notify-subscription-ids" operation
   attribute, the Printer ignores the extra values.

   Note: If a Notification Recipient performs two consecutive Get-
   Notifications operations with the same value for "notify-sequence-
   number" (or omits the attribute), the time stamp value of the first
   Event Notification in the second Get-Notifications Response may be
   less than that of the time stamp of the last Event Notification in
   the first Get-Notification Response.  This happens because the
   Printer sends all unexpired Event Notifications with an equal or
   higher sequence number according to the ordering specified in
   [RFC3995], and some Event Notifications from the first Get-
   Notifications operation may not have expired by the time the second
   Get-Notifications operation occurs.

5.1.3.  notify-wait (boolean)

   This value indicates whether the Notification Recipient wants Event

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