RE: Defined Private Use was: SSP default ignorable characters

From: Peter Constable (
Date: Wed Apr 28 2004 - 15:23:23 EDT

  • Next message: Philippe Verdy: "Re: Defined Private Use was: SSP default ignorable characters"

    > While applications are of course not
    > obliged to support the PUA, if they choose to do so there should be no
    > expectation that they are party to any agreement. And so a group of
    > users with a private agreement can reasonably assume that software
    > supports the PUA in general supports their particular agreement.

    Since there is not and cannot be any common specification for what it
    means for an application to support the PUA, no assumptions can be made
    by users about what an application does beyond what the application
    vendor explicitly commits to. There is no rule anywhere that says that
    an application must support whatever their customers might assume about
    the PUA. The application vendor itself is a user of the Unicode
    Standard, and is free to make it's own private assumptions.

    (Of course, it may help their customers if they don't make too many


    Peter Constable
    Globalization Infrastructure and Font Technologies
    Microsoft Windows Division

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