Re: Defined Private Use was: SSP default ignorable characters

From: Philippe Verdy (
Date: Thu Apr 29 2004 - 04:58:52 EDT

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    From: "Peter Kirk" <>
    > Philippe Verdy wrote:
    > >This means that this document URI can be inserted within the font (I'm quite
    > >sure that the OpenType format already has such meta-tags table, in which a
    > >could be inserted to access those properties).
    > Why refer to something which needs to be downloaded separately from the
    > Internet? I can't imagine users being very happy if their characters are
    > displayed only when they are connected to the Internet, and so not when
    > on the road with a laptop etc etc. And there are still an awful lot of
    > computer users worldwide with no Internet access or only occasional and
    > expensive dial-up access.

    Why do you think that using a URI necessarily requires a Internet connection?
    A URI is only an identifier, made unique using either a global registry or using
    some other methods (an URI can contain a UUID too, or a SGML public ID, or any
    other identifier schemes).

    My point is that, if such private agreement exist between private users, they
    must have exchanged in some way their agreement. A part of this exchange may be
    as well a set of data files, and in fact it is waht is then expected when they
    will want to interchange their own private data.

    A URI is not restricted to Internet and even if it's a active URL which can be
    dereferenced on the Internet, there's no requirement to do so. Look for example
    about the SGML public identifiers that are used to indicate document types. Most
    browsers will (and should) recognize those identifiers and will resolve them
    locally if this URI is mapped into a local registry of known schemas, without
    needing to retreive the DTD from that URL. Do you know SAX Entity Resolvers?

    Same analogy for the XML namespaces.

    Consider then this URI as a namespace with no required dereference and you're

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