UPD Mail Archive: RE: UPD> Re: IPP> min/max custom size v

RE: UPD> Re: IPP> min/max custom size values

From: Hastings, Tom N (hastings@cp10.es.xerox.com)
Date: Tue Apr 03 2001 - 15:30:22 EDT

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    I agree that real applications need to know about combinations of media
    attributes. However, each print protocol has different ways to deal with
    that. So I think it is wiser for the Media standard to just list the names
    of the various characteristics and leave it to the various Print protocols
    do deal with combinations.


    For example, have you seen the IEEE-ISTO PWG 5100.3 Production Printing
    Extension, which does combine the media attributes into a collection, so
    that combinations can be configured by the administrator. However, even
    that spec does not have a way for the client to query the supported
    combinations. Last summer and fall, the IPP WG considered a proposal for a
    Resource object that had a number of operations to create, delete, and query
    Resource objects of a defined type. Media was a suggested type. Then the
    group agreed that IPP should really have distinct set of operations for each
    object type, so that we need to write a spec for the Media object that has
    operations, like Create-Media, Delete-Media, Get-Media-Attributes, Get-Media
    (with a filter).

    Are you interested in seeing such a spec and reviewing and/or contributing
    to it?

    An another example or a print protocol that deals with the combinations
    problem, the UPnP EnhancedLayoutPrint template defines a GetMargins
    operation in which the input parameters are MediaType and MediaSize and the
    output parameter is the four margins. If the client supplies a combination
    of MediaType and MediaSize that is not supported, the Printer MUST return an
    error code.


    -----Original Message-----
    From: Mark VanderWiele [mailto:markv@us.ibm.com]
    Sent: Friday, March 30, 2001 07:44
    To: Norbert Schade
    Cc: UPD group; IPP Group; Pete Zannucci; Mark_Hamzy/Austin/IBM%IBMUS
    Subject: Re: UPD> Re: IPP> min/max custom size values

    Careful, we may be making the same mistake we made in IPP where the form
    size, media type, and tray are returned separately causing user interface
    nightmare since all three of these really must be selected together and
    represent the actual configuration of the printer. Therefore, I would
    propose that when we have settled in on a syntax for the form size, media
    type, and tray we go one step further and define a way to join the fields
    so that the proper constraints can be represented. Perhaps a simple "+"
    character. Again, form size by itself is meaningless.

    Mark VanderWiele
    IBM, Linux Tecnology Center
    512-838-4779, t/l 678-4779
    email: markv@us.ibm.com

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