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[Bug 22524] [XT3TS] number-0819, 0821

From: <bugzilla@jessica.w3.org>
Date: Mon, 30 Mar 2015 00:52:06 +0000
To: public-qt-comments@w3.org
Message-ID: <bug-22524-523-RxjfvVFruJ@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=22524

--- Comment #4 from Abel Braaksma <abel.braaksma@xs4all.nl> ---
Tim Mills wrote:
> expected result starts with 0 (&#x30), not a circled zero (&#x2460).

Michael Kay wrote:
> For example, the format token &#x2460; (circled digit one, ①) has a range 
> imposed by the Unicode character repertoire — 1 to 20 in Unicode versions 
> prior to 4.0, increased in subsequent versions.

However, CIRCLED DIGIT ONE is U+2460, ZERO is U+24EA. They are not consecutive.
Both have been around since Unicode 1.1. 

Are we suggesting here that the outcome from a processor should (optionally?)
be:

<out> 0 ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ 21 22 23 24 25</out>

Or:
<out> ⓪ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ 21 22 23 24 25</out>

Or even: 
<out> ⓪ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ ㉑ ㉒ ㉓ ㉔ ㉕</out>

Numbers up to 50 have been supported since Unicode 3.3.

These ranges are not consecutive:
0:     24EA          (since 1.1, 1993)
1-20:  2460 - 2473   (since 1.1, 1993)
21-35: 3251 - 325F   (since 3.2, 2002)
36-50: 32B1 - 32BF   (since 3.2, 2002)

So for these Unicode ranges in particular, it is incorrect that only 1 to 20
existed in Unicode prior to 4.0. All these circled digits where added earlier.

This means that the sentence in the XSLT 3.0 spec is possibly incomplete: "For
example, the formatting token &#x2460; (circled digit one) has a range of 1 to
20 imposed by the Unicode character repertoire."

I am not sure how to move forward. Since these ranges fall under
implementation-defined behavior (and add to that the supported Unicode version
is implementation-defined as well), I don't think there's anything we can force
here, so I propose that the result of the test should iterate these
alternatives.

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