Offtopic: Web Standards Project
cowan at locke.ccil.org
Tue Aug 11 18:10:06 BST 1998
Toby Speight wrote:
> Well, I'm sure there would be plenty here who'd like to know. ASCII
> is a 7-bit character coding scheme - nothing more, nothing less. The
> term "8-bit ASCII" could be used to refer to any of a number of 8-bit
> codes which coincide with ASCII for values under 128: ISO-8859-1,
> ISO-8859-2, ..., ISO-8859-9, ISO-2022-JP (I think), the Windows and
> Macintosh character sets, and others.
ISO/IEC 8859-1 is, or was, reimplemented as an American National
Standard under the title "8-bit American Standard Code for Information
Interchange", i.e. "8-bit ASCII". (I can't find this in the current
ANSI catalog, so it may have been revoked in favor of 8859-1.)
However, this has nothing to do with the charset name "US-ASCII",
which refers only to 7-bit ISO/IEC 646:1991, which is the same as
7-bit ASCII, ANSI X3.4.
> [BTW, when using US-ASCII as an entity character encoding, must one
> declare it as UTF-8, and use other means to ensure that multi-byte
> characters don't occur?]
No, you can declare it as "US-ASCII". In theory, parsers may throw
a fatal error because they don't support that encoding. In practice,
no parser is at all likely to do so.
John Cowan http://www.ccil.org/~cowan cowan at ccil.org
You tollerday donsk? N. You tolkatiff scowegian? Nn.
You spigotty anglease? Nnn. You phonio saxo? Nnnn.
Clear all so! 'Tis a Jute.... (Finnegans Wake 16.5)
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