It sounds like what you are saying, in concrete terms, is that Font #6
at the bottom of:
http://www.macchiato.com/utc/variation_selection/variation_selection_f
ollowup.htm
is conformant. If that is so, then we would have to have an additional
VS to select the "closed" form of the glyph. In that case, one could
only depend on a visual distinction based upon the description if the
font supported both of the VS sequences. I can see your point.
Mark
—————
Πόλλ’ ἠπίστατο ἔργα, κακῶς δ’ ἠπίστατο πάντα — Ὁμήρου Μαργίτῃ
[For transliteration, see http://oss.software.ibm.com/cgi-bin/icu/tr]
----- Original Message -----
From: "Asmus Freytag" <asmusf@ix.netcom.com>
To: "Mark Davis (jtcsv)" <mark.davis@jtcsv.com>; "David Hopwood"
<david.hopwood@zetnet.co.uk>; <unicode@unicode.org>; "Unicore"
<unicore@unicode.org>; <mark@macchiato.com>
Sent: Sunday, January 27, 2002 01:49
Subject: Re: Variation Selection (Was Re: Unicode 3.2: BETA files
updated)
> At 12:33 AM 1/27/02 -0800, Mark Davis \(jtcsv\) wrote:
> >>I find it fairly pointless to say that a font "supports" the
variation
> >>selection sequence <U+03B8, U+FE00> if it does not provide a
visual
> >>distinction from <U+03B8>; and such a distinction should be based
on the
> >>entry description. Thus, of the following four fonts, only number
4
> >>correctly supports the sequence <U+03B8, U+FE00>. (Of course, any
real
> >>font would have designs for the two glyphs that were a bit more
harmonious!)
>
> I couldn't view your examples, but guessing at what they might have
been,
> I'll risk an answer.
>
> The problem is that some of the distinctions for which variant
selectors
> are used, are *needed only by a minority of users*. Some of the math
> variants (not PHI, or THETA, but the ones in StandardizedVariants)
may only
> be needed by *some* math authors.
>
> Any requirement that by supporting VS1, one must restrict the glyph
range
> of the unmarked symbol forces either
>
> a) the tail to wag the dog
>
> or
>
> b) many dogs to do without tail
>
> Case a is where fonts assume the most restrictive glyph choice for
the
> unmarked symbol, so that they can be used by all users. This is bad
since
> the restricted glyph range for the unmarked symbol may be a somewhat
> unnatural one. Given the expense of creating a math font, it may not
make
> sense to do one that is not usable by all math authors.
>
> Case b is where fonts assert their choice of unmarked glyph and
(because of
> the required contrast) choose not to support the VS1 form, since
that's the
> form they want to use as the unmarked default. Given the expense of
> creating a math font, the sub-set of math authors may not have the
> werewithal to source a font for their needs, since most of the
market can
> be covered by something that is 'good enough'.
>
> By explicitly defining a way to restrict the glyph range (via coding
> another character, or another VS sequence) it becomes easier to
support
> groups with related needs, but different requirements in the face of
variants.
>
> A./
>
>
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