[whatwg] Superset encodings [Re: ISO-8859-* and the C1 control range]
Øistein E. Andersen
liszt at coq.no
Wed Oct 21 14:39:00 PDT 2009
On 19 Oct 2009, at 05:52, Ian Hickson wrote:
> I've noted your e-mail here [...] and moved the whole thing out of
> the spec.
That does not seem to apply to the last part of the original e-mail,
Øistein E. Andersen
> Other character encoding issues:
> The note in ‘2.1.5 Character encodings’ seems to say that ‘variants
> of ISO-2022’ (presumably including common ones like ISO-2022-CN,
> ISO-2022KR and ISO-2022-JP) are ASCII-compatible, whereas HZ-GB-2312
> is not, and I cannot find anything in Section 2.1.5 that would
> explain this difference.
> Discouraged encodings:
> ‘126.96.36.199 Specifying the document's character encoding’ advises
> against certain encodings. (Incidentally, this advice probably
> deserves not to be ‘hidden’ in a section nominally reserved for
> character encoding *declaration* issues.) In particular:
>> Authors should not use JIS-X-0208 (JIS_C6226-1983), JIS-X-0212
>> (JIS_X0212-1990), encodings based on ISO-2022, and encodings based
>> on EBCDIC.
> It is not clear what this means (e.g., the character set
> JIS_C6226-1983 in any encoding, or only when encoded alone according
> to RFC1345 as described above); the list of discouraged encodings
> seems conspicuously short if it is supposed to be complete; and the
> lack of rationale makes it difficult to understand why these
> encodings are considered particularly harmful (JIS_C6226-1983 v.
> JIS_C6226-1978 or ISO-2022 v. HZ, to mention but two at least
> initially puzzling cases). It might be better to say *why*
> particular encodings are better avoided, whether or not the list of
> discouraged encodings be presented as definitive.
> Minor grammar detail in 188.8.131.52:
>> Conformance checkers may advise against authors using legacy
> This is ambiguous. It should probably be ‘advise against authors’
> using legacy encodings’ or better ‘advise authors against using
> legacy encodings’.
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