On 2/27/20 11:52 AM, Victor Zverovich wrote:
> I agree that Hubert's last option is the one we want here.
>
> > encoding schemes that support escape sequences or some other form of
> markup should be excluded
>
> Could you give an example of such encoding scheme?

Only in theory. I can imagine an ISO-2022 encoding that supports escape
sequences to swap the active character set to UTF-8 or something. I
don't know of any real encodings that encode Unicode code points and
support escape sequences or markup.

Tom.

>
> - Victor
>
> On Wed, Feb 26, 2020 at 7:22 AM Tom Honermann <tom_at_[hidden]
> <mailto:tom_at_[hidden]>> wrote:
>
> On 2/26/20 2:39 AM, Corentin Jabot via Lib wrote:
>>
>>
>> On Wed, 26 Feb 2020 at 02:38, Hubert Tong via SG16
>> <sg16_at_[hidden] <mailto:sg16_at_[hidden]>> wrote:
>>
>> In [format.string.std], the meaning of "Unicode encoding"
>> added by P1868R2 is unclear. One interpretation of what was
>> meant by "Unicode encoding" is "UCS encoding scheme" (as
>> defined by ISO/IEC 10646). Another interpretation is an
>> encoding scheme capable of encoding all UCS code points that
>> have been assigned to characters. Yet another interpretation
>> is an encoding scheme capable of encoding all UCS scalar values.
>>
>>
>> Any encoding scheme capable of encoding any UCS codepoint -
>> where a UCS codepoint is tautologically any value in the UCS
>> codespace (U+0 - U+10FFFF)
>
> I'd like Victor to weigh in, but I think Hubert's last
> interpretation meets minimum requirements. It might be simplified
> to "any encoding scheme that encodes (only) UCS scalar values"
> (encoding schemes that support escape sequences or some other form
> of markup should be excluded).
>
> I think the definition/description of "Unicode Character Encoding
> Schemes" in UTR #17 section 5
> (https://www.unicode.org/reports/tr17/#CharacterEncodingScheme)
> fits what we're after.
>
> Tom.
>
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>
>