From: Peter Kirk (firstname.lastname@example.org)
Date: Wed Nov 24 2004 - 18:53:12 CST
On 24/11/2004 22:23, Peter Kirk wrote:
> On 24/11/2004 22:00, Asmus Freytag wrote:
>> The sequence SPACE NBSP *does* not allow a break after the SPACE
>> under the line breaking rules we publish in UAX#14.
>> The common usage in HTML, is to use one or more NBSP followed by
>> SPACE to mark a wider space, that allows a break at the end. NBSPs
>> are not coalesced with other spaces.
>>> In the Hebrew case, it is probably necessary to precede the NBSP
>>> with RLM to ensure that the NBSP and combining mark are taken with
>>> the rest of the word as right-to-left. Does this inserted RLM affect
>>> the situation with HTML, XML etc?
>> You are always free to surround the NBSP with other format
>> characters, such as RLM or ZWSP, to tailor whatever behavior those
>> format characters affect.
> Thank you.
> What if I used the sequence <RLM, NBSP, combining mark>? Would I then
> get a break opportunity before the RLM, if it is preceded by SPACE?
> Presumably LRM could be used similarly if the same situation occurs in
> a left-to-right language.
I note that there is a relevant change being proposed to UAX #29 (public
review issue #51), in that NBSP is now to be treated as a letter for
determination of word and sentence boundaries. This certainly helps with
the use of NBSP as a carrier for spacing diacritics, as e.g. in Hebrew.
Also the following clarification is being proposed for UAX #16 on line
breaking (public review issue #56):
> The preferred base character for showing combining marks in isolation
> is U+00A0 No-Break SPACE. If a line break before or after the
> combining sequence is desired, U+200B ZERO WIDTH SPACE can be used.
> The use of U+0020 SPACE as a base character is deprecated.
But this draft also states:
> when NBSP follows SPACE, there is a break opportunity after the SPACE
> and NBSP will go as visible space onto the next line.
This is different from what Asmus stated above: "The sequence SPACE NBSP
*does* not allow a break after the SPACE". So is this actually a
proposed change to the line breaking rules? If so, it is one I support.
-- Peter Kirk email@example.com (personal) firstname.lastname@example.org (work) http://www.qaya.org/
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