From: Peter Constable (petercon@microsoft.com)
Date: Thu May 19 2005 - 10:46:13 CDT
> From: unicode-bounce@unicode.org [mailto:unicode-bounce@unicode.org]
On Behalf
> Of Dean Snyder
> Stateful mechanisms that contribute to fragility at the character
level -
> Surrogates
> BOM
>
> Stateful mechanisms that contribute to fragility above the character
level -
> Bidirectional Ordering Controls
> Annotation characters
Note that surrogates, BOM and annotation characters (FFF9..FFFB) are not
used in the text content of a file:
- BOM is a control used within certain encoding-scheme mechanisms
- the surrogate *codepoints* are not assigned to characters; surrogate
*code units* are used within a particular encoding-form mechanism
- annotation characters are intended for process-internal usage (like
the non-characters at FDD0..FDEF), not for interchange
What you say about the bidi controls is entirely correct, though.
Peter Constable
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