IPP Mail Archive: IPP> 'any' out-of-band value

IPP> 'any' out-of-band value

From: kugler@us.ibm.com
Date: Tue Jun 27 2000 - 20:03:28 EDT

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    At one time, I believe the Set 2 Ops proposal included an 'any' out-of-band
    value. But I don't see it in the spec anymore. 'Anyway', I'd like to
    raise this issue again, since we have run into this problem again in
    product development.

    The key place where we need the 'any' out-of-band value is in
    "document-format-supported". Some IPP Printers are actually proxy gateways
    to downstream print services of some kind. It's not always possible to
    know what document-formats are supported downstream. One example comes
    from the IPP model document itself: a Printer can represent a logical
    device such as "a gateway into an online document archive or repository".
    The archive or repository may "support" any document format. But there is
    no way to indicate this in IPP.

    Lacking an 'any' value, the best solution (hack) we have come up with is to
    respond with "document-format-supported" (if applicable) containing
    'application/octet-stream' plus whatever "document-format" the client might
    have supplied in the request. But this could be confusing to some clients,
    and is in direct violation of the spec: "The values of all other Printer
    object attributes (including "document-format-supported") remain invariant
    with respect to the client supplied document format..."

    Could you discuss this in San Fran? I will try to make at least part of
    the telecon tomorrow.

         -Carl



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