Emoji Variation Sequences: relaxing VS15/16
roozbeh at unicode.org
Mon Aug 22 18:24:51 CDT 2016
I agree that this should be relaxed for VS15 and VS16. For example, the
current draft version of UTR #51 even suggests that this be done for three
sequences that can not get variation sequences defined until Unicode 10.0.
Would you please write a proposal document or send a note through
On Thu, Aug 18, 2016 at 3:20 AM, Christoph Päper <
christoph.paeper at crissov.de> wrote:
> While VS1–VS14 (and VS17–256) are used for more or less arbitrary variant
> selection (VS4–VS14 are actually still unused), VS15 and VS16 have
> conventional de-facto semantics: select text style or emoji style.
> StandardizedVariants.txt explicitly claims, referring to Section 23.4 of
> Unicode 9, that implementations must ignore VSs that don’t form a
> standardized or ideographic variation sequence <http://unicode.org/Public/
> > Standardized variation sequences are defined in this file.
> > Ideographic variation sequences are defined according to the registration
> > process specified in UTS #37, and are listed in the Ideographic
> > Variation Database. Only those two types of variation sequences
> > are sanctioned for use by conformant implementations.
> > In all other cases, use of a variation selector character does
> > not change the visual appearance of the preceding base character
> > from what it would have had in the absence of the variation selector.
> > For more information on standardized variation sequences,
> > see Section 23.4, Variation Selectors,
> > in The Unicode Standard, Version 9.0.
> Can this be relaxed for VS15 and VS16?
> Unlike VS1–VS3 they don’t operate on arbitrary glyph differences but on
> the actual Unicode property `Emoji_Presentation`. <http://www.unicode.org/
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