IPP Mail Archive: IPP> RFC 3391 - The MIME Application/Vnd.p

IPP Mail Archive: IPP> RFC 3391 - The MIME Application/Vnd.p

IPP> RFC 3391 - The MIME Application/Vnd.pwg-multiplexed Content-Type

From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Thu Dec 19 2002 - 14:34:51 EST

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    Hi folks,

    Finally, Bob Herriot's work has been published. Relevant to
    XHTML-Print, PWG PSIv1, FSG PAPIv1, UPnPv2, and others.

    Please note the "IESG Note" at the beginning (see below).

    - Ira McDonald
      High North Inc

    IESG Note

       The IESG believes use of this media type is only appropriate in
       situations where the producer is fully aware of the capabilities and
       limitations of the consumer. In particular, this mechanism is very
       dependent on the producer knowing when the consumer will need a
       particular component of a multipart object. But consumers
       potentially work in many different ways and different consumers may
       need different things at different times. This mechanism provides no
       means for a producer to determine the needs of a particular consumer
       and how they are to be accommodated.

       Alternative mechanisms, such as a protocol based on BEEP which is
       capable of bidirectional communication between the producer and
       consumer, should be considered when the capabilities of the consumer
       are not known by the producer.


       The Application/Vnd.pwg-multiplexed content-type, like the
       Multipart/Related content-type, provides a mechanism for representing
       objects that consist of multiple components. An
       Application/Vnd.pwg-multiplexed entity contains a sequence of chunks.
       Each chunk contains a MIME message or a part of a MIME message. Each
       MIME message represents a component of the compound object, just as a
       body part of a Multipart/Related entity represents a component. With
       a Multipart/Related entity, a body part and its reference in some
       other body part may be separated by many octets. With an
       Application/Vnd.pwg-multiplexed entity, a message and its reference
       in some other message can be made quite close by chunking the message
       containing the reference. For example, if a long message contains
       references to images and the producer does not know of the need for
       each image until it generates the reference, then
       Application/Vnd.pwg-multiplexed allows the consumer to process the
       reference to the image and the image before it consumes the entire
       long message. This ability is important in printing and scanning
       applications. This document defines the Application/Vnd.pwg-
       multiplexed content-type. It also provides examples of its use.

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