Semantic Model Mail Archive: SM> RE: IPP> "-actual&q

Semantic Model Mail Archive: SM> RE: IPP> "-actual&q

SM> RE: IPP> "-actual" multivalue types issue

From: Zehler, Peter (
Date: Mon Oct 28 2002 - 10:13:12 EST

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    In your example the "-actual" would contain the "sides-actual",
    "media-actual" and "SeparatorSheets-actual" attributes. The
    "SeparaterSheets-actual" attributes contains "media" and "sides". It is
    clear and unambiguous what actually occurred. The "-actual" attributes
    carry the same semantic and syntax as the base attributes. Keeping alignment
    between "-actual" and the base attribute will provide significant "Job
    Receipt" functionality at a low cost while avoiding additional work for the
    printer. It is easier to simply copy attributes over and change its name
    than to also remap its syntax and semantics.

                                    Peter Zehler
                                    Xerox Architecture Center
                                    Voice: (585) 265-8755
                                    FAX: (585) 265-8871
                                    US Mail: Peter Zehler
                                                    Xerox Corp.
                                                    800 Phillips Rd.
                                                    M/S 128-30E
                                                    Webster NY, 14580-9701

    -----Original Message-----
    From: Dennis Carney []
    Sent: Friday, October 25, 2002 10:53 AM
    To: Zehler, Peter
    Subject: Re: IPP> "-actual" multivalue types issue


    My idea was that since these "-actual" attributes are supposed to tell you
    what *actually happened*, they should cover the case where more than one
    value was used.

    An example: a job is submitted from Windows with a Windows separator page.
    The separator page prints from tray 1, blue paper, simplex; the main job
    prints from tray 3, white paper, duplex. Both the media-actual and
    sides-actual attributes would have two values. As it turns out, a
    submitting IPP client on Windows (port monitor) can find out from Windows
    that the job has a separator page, but has no way to find out from Windows
    about media or plex. Therefore, such a client can interpret the two values
    to mean the first is for the separator page, the second is for the job.
    This interpretation will be right almost all of the time.

    This proposal is supposed to address the "job receipt" shortcoming without
    adding a lot of work to the Printer or the standards body :-). With that
    in mind, I could be persuaded to get rid of the multivalued aspect. But I
    think it adds (possibly) significant functionality at a low cost.



                          "Zehler, Peter"

                          <PZehler@crt.xero To: Dennis

                > cc:

                          Sent by: Subject: IPP> "-actual"
    multivalue types issue



                          10/24/02 08:56 AM



    My first comment is that the data types of the processing attribute should
    be the same as the base's. The base's definition determines if the
    element can be multivalued. If the base can not be multivalued the actual
    should not be either.

                                                     Peter Zehler
                                                     Xerox Architecture Center
                                                     Voice: (585) 265-8755
                                                     FAX: (585) 265-8871
                                                     US Mail: Peter Zehler
    Phillips Rd.

    Webster NY, 14580-9701

    -----Original Message-----
    From: Dennis Carney []
    Sent: Friday, October 18, 2002 1:54 AM
    Subject: SM> ACT - IPP "-actual" attributes downloaded, version 0.1


    I have downloaded the first draft (version 0.1) of the document 'IPP: "
    -actual" attributes extension'. The document is 12 pages long, but the
    proposal is only 5 of those pages. The document is located at:

    This document will be discussed on the October 31 Semantic Model
    teleconference. Any comments should be sent to the IPP mailing list.

    This document defines an extension to the Internet Printing Protocol/1.0
    (IPP/1.0) [RFC2566, RFC2565] & IPP/1.1 [RFC2911, RFC2910] for the OPTIONAL
    "-actual" set of Job Description attributes that correspond to Job Template
    attributes defined in IPP. These "-actual" attributes allow the client to
    determine the true results of a print job regardless of what was specified
    in the Create-Job or Print-Job operation.

    Dennis Carney
    IBM Printing Systems

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