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

   printer-state (type1 enum)                    MUST    Printer
   printer-state-reasons (1setOf type2 keyword)  MUST    Printer
   printer-is-accepting-jobs (boolean)           MUST    Printer

6.  Additional Information about Subscription Template Attributes

   The 'ippget' Delivery Method does not define any addition
   Subscription Template attributes and has the conformance requirements
   for Subscription Template attributes defined in [RFC3995].  This
   section defines additional information about Subscription Template
   attributes defined in [RFC3995].

6.1.  notify-pull-method (type2 keyword)

   This Subscription Template attribute identifies the Pull Delivery
   Method to be used for the Subscription Object (see [RFC3995]).  To
   support the 'ippget' Pull Delivery Method defined in this document,
   the Printer MUST support this attribute with the following keyword
   value:

     'ippget':  Indicates that the 'ippget' Pull Delivery Method is to
       be used for this Subscription Object.

7.  Subscription Description Attributes

   The 'ippget' Delivery Method has the conformance requirements for
   Subscription Description attributes defined in [RFC3995].  The
   'ippget' Delivery Method does not define any addition Subscription
   Description attributes.

8.  Additional Printer Description Attributes

   This section defines additional Printer Description attributes for
   use with the 'ippget' Delivery Method.

8.1.  ippget-event-life (integer(15:MAX))

   This Printer Description attribute specifies the Event Life value
   that the Printer assigns to each Event; i.e., the number of seconds
   after an Event occurs during which a Printer will return that Event
   in an Event Notification in a Get-Notifications response.  After the
   Event Life expires for the Event, the Printer MAY no longer return an

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