Re: bidi

From: Asmus Freytag (
Date: Thu May 13 2004 - 02:36:23 CDT

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    At 07:09 PM 5/12/2004, Chris Jacobs wrote:
    > > The Unicode Standard is a plain text standard, *not* a
    > > text layout standard. See Section 2.9 of The Unicode
    > > Standard, Version 4.0 for what the standard has to say
    > > on this.
    > >
    > > The extent of directional layout required of a *plain text*
    > > standard is the bidirectional algorithm, which sorts
    > > out how a (horizontal) *line* of text is laid out when
    > > text of opposite directions is mixed. Beyond that, you
    > > are on to higher level protocols for textual layout.
    > > Those are out of scope for the Unicode Standard.
    > >
    > > --Ken
    >And even for a "(horizontal) *line* of text"
    >If you have rich text, so you can choose to use either the bidi algorithm or
    >the rich text facilities to do the bidi.
    >Then the rich text facilities are preferable?

    Not necessarily. Depends a lot on what you meant to say by 'either / or'
    here. Please read the relevant text on Higher Level Protocols in the latest
    edition of UAX#9

    It's very clear about the role of higher level (rich text) protocols.


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