Semantic Model Mail Archive: SM> Simple Device extension to

Semantic Model Mail Archive: SM> Simple Device extension to

SM> Simple Device extension to Semantic Model

From: McDonald, Ira (imcdonald@sharplabs.com)
Date: Wed Jul 16 2003 - 13:32:52 EDT

  • Next message: McDonald, Ira: "SM> RE: IPP> Simple Device extension to Semantic Model"

    Hi folks, Wednesday (16 July 2003)

    Proposal for a simple Device extension to the PWG Semantic Model:

    (1) Add a "PrinterRole" element to the Printer object, with legal values
        'logical' (PSI Print Service, IPP Printer, etc.), 'physical' (PSI
        Target Device, SNMP Device, etc.), or 'logical-and-physical' (for
        consistency with ISO 10175 DPA's "printer-realization" attribute
        and a number of shipping vendor implementations of DPA).

    (2) Any 'logical' Printer object MAY support (e.g., via PSI's
        GetTargetDeviceElements) returning its 'best effort knowledge'
        of the elements of local surrogate 'physical' Printers (Devices).
        The URI of each local surrogate 'physical' Printer is formed by
        concatenating:

        (a) Any URI value of the "PrinterUriSupported" element (e.g., a
            'pwg-psips:' value), and
        (b) a single dot '.', and
        (c) any value of the "OuputDeviceSupported" element.

    (3) A 'physical' Printer supports all standard Printer elements and MAY
        also support the "PrtXXX" elements extracted from the IESG-approved
        final draft of Printer MIB v2 (for the WBMM effort).

    Comments?

    Cheers,
    - Ira McDonald
      High North Inc

    PS - Mapping this PWG Semantic Model extension back to IPP is trivial.

    The latest IPP Job Extensions spec defines "output-device" (a client
    supplied Job Creation operation attribute) and "output-device-supported"
    (a Printer attribute that bounds the values of "output-device" and the
    existing "output-device-assigned", a Job Description attribute).

    An 'ipp:' value of "printer-uri-supported" on an IPP 'logical' Printer
    MAY be suffixed with a dot and a value of "output-device-supported" to
    form the URI of an IPP 'physical' Printer with "prt-xxx" attributes.

    Existing Get-Printer-Attributes and Set-Printer-Attributes operations
    MAY be used to manage and configure an IPP 'physical' Printer. No new
    IPP operations are required to add Device support to IPP.



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