Semantic Model Mail Archive: SM> IPP Document Object Spec av

Semantic Model Mail Archive: SM> IPP Document Object Spec av

SM> IPP Document Object Spec available for Thursday, April 10, SM Tel econ, 10-11 PDT (1-2 EDT)

From: Hastings, Tom N (
Date: Wed Apr 09 2003 - 07:54:04 EDT

  • Next message: "SM> Dead-on-arrival proposal from "IPP Document Object Spec available for Thursday, April 10, SM Telecon, 10-11 PDT (1-2 EDT)""

    I've finished the editing on the IPP Document Object Spec and have down
    loaded it to: 1353 KB 326 KB

    This will be reviewed on Thursday, April 10, SM Telecon, 10-11 PDT (1-2

    Sorry for the short notice, but the editing took way more time than I

    Version 0.9, 7 April 2003, agreements from the April 3 telecon:
            1. Added "document-charset" (charset),
    "document-digital-signature" (type2 keyword), "document-format-version"
    (text(127)), and "document-natural-language" (naturalLanguage) Operation and
    Document Description attributes and corresponding "xxx-default" and
    "xxx-supported" Printer Description attributes.
            2. Changed the "document-natural-language" member attribute of
    "document-format-details" (1setOf collection) operation attribute to be
    1setOf, but kept the top level "document-natural-language" Operation
    attribute as single-valued.
            3. Added Summary Table 2 of new Operation/Document Description
            4. Defined CONDITIONALLY REQUIRED and CMUST Conformance Terms.
            5. Deleted the "document-id-uri" Operation attribute no longer
    needed by PSI.
            6. Changed "ipp-attribute-fidelity" so it doesn't affect
    operation attributes, so it is the same as in [RFC2911].
            7. Clarified the operation attributes supplied at the Job Level
    in Print-Job and Print-URI versus Create-Job by introducing the "p" notation
    in Table 7.
            8. Added columns to Table 7 to show the corresponding Document
    Description attributes and the "xxx-default" and "xxx-supported" Printer
    Description attributes.
            9. Clarified that all of the new Operation attributes are
    hints, except "document-charset" and "document-format" and that the client
    can turn them into Must Honor by supplying their keyword attribute names in
    the "job-mandatory-attributes Operation attribute.
            10. Add the unique lang prefix from the Printer MIB to all
    "document-format-version" values, so that they can all be in a single flat
    list for the Printer's "document-format-version-supported" Printer
    Description attribute.

    There are four issues embedded in the document and a 5th from Dennis (see

    6.1.1 document-charset (charset)
    ISSUE 01: Since we agreed that this attribute isn't a hint, OK to make it
    CONDITIONALLY REQUIRED for Printers that support charset-ambiguous document

    If the Printer supports this "document-digital-signature" Operation
    attribute and the value supplied by the client, the Printer MUST verify the
    signature according to the rule for that signature format. If the signature
    does not verify, then the Printer MUST either (1) ignore the signature or
    (2) put the job on hold and wait for human intervention, depending on
    implementation. The Printer gives no additional indication to the client.
    ISSUE 02: Is either (1) ignore the signature or (2) put the job on hold the
    correct behavior for the Printer if the digital signature doesn't verify?

    This Printer behavior is backwards compatible with a Printer that doesn't
    support the "digital-signature" attribute. However, if the Printer supports
    the "job-mandatory-attributes" attribute (see section 8.1.2) and the client
    supplies the "job-mandatory-attribute" Operation attribute with the
    'digital-signature' keyword value, then the Printer MUST reject the job if
    the "digital-signature" attribute is supplied with a value that isn't
    supported by the Printer (or the Printer doesn't support the
    "digital-signature" attribute at all). Thus the client can force the
    Printer to reject a signed document for a signature technology that the
    Printer does not support. ISSUE 03: What if the digital signature is
    supported, but the signature fails verification by the Printer when
    "job-mandatory-attributes" identifies 'document-digital-signature'?

    The values of the "document-format" and their corresponding
    "document-format-version" values will be kept in a flat text file on the PWG
    server for use by the PWG and CIP4. Implementers and implementations will
    be able to access this file at any time (at CD writing time, install time,
    vendor update time, and/or at power-up time, etc.). New values will be
    added to the flat file by its Maintainer after sending to the PWG list for a
    two week review whenever they are registered with or standardized by some
    recognized body, such as IANA, CIP4, ISO, etc. ACTION ITEM (Tom): Get CIP4
    buy-in to use the same flat file (which will require an additional field for
    the JDF FileType attribute. ACTION ITEM (Tom and Ira): Propose a format for
    the file. The URL is:
           ISSUE 04: What should
    the URL be for the flat file? What is the formatting conventions for the
    flat file. Is it a PWG Schema of sorts?

    and here is ISSUE 05 from Dennis Carney:

    - I brought this up on the call, but I'll mention it again, since I'm not
    sure whether it was resolved. You sell a printer. You happen to have
    found out that some specific thing goes wrong when a user uses Powerpoint
    2000 on Windows NT 4.0, such that your printer always messes up the
    printout. How do you specify this in document-format-details-implemented?
    And a much simpler issue on these same lines: why would *anyone*, ever,
    return any values for the document-creator-application-name-implemented or
    document-creator-application-version-implemented member attributes--why
    would anyone want to try to list all applications they support? Similarly
    for the two "os" member attributes--I might know I don't provide special
    drivers for Macintosh, but anyone using an LPR utility on Macintosh, with a
    PDF file, *can* print to me from Macintosh. Even if there *were* some OSes
    I wanted to say I don't support (which seems doubtful), I have to do this
    by listing all *other* OSes? I guess in summary: I can see the use for the
    5th-8th member attributes of document-format-details-implemented, but not
    for the 1st-4th.


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