ISSUE-2058: Lack of BIDI 'direction'

BIDI 'direction'

Lack of BIDI 'direction'

State:
CLOSED
Product:
SVG 1.2 Tiny: Last Call
Raised by:
Doug Schepers
Opened on:
2008-09-17
Description:
fantasai
<http://lists.w3.org/Archives/Public/www-svg/2008Sep/0058.html>:
[[
There's discussion in http://www.w3.org/TR/SVGMobile12/text.html about
bidirectional text, but there is no definition for a 'direction' property
that I can find, nor any mention of any substitute for it (such as a 'dir'
attribute).

This is a problem because the Unicode bidirectional algorithm needs a
base direction for each "paragraph" that it operates on. For plain text
it guesses based on the first character in the text, but this is not
always accurate. Applying this rule to SVG Tiny would be incompatible
with an implementation that supported SVG Tiny plus the 'direction'
property because 'direction' defaults to 'ltr', not to 'guess a direction'.

The lack of a 'direction' affects both bidi reordering and other properties
like 'text-align', whose values' behavior depends on 'direction'.

I therefore strongly recommend that SVG Tiny include the 'direction'
property.
]]
Related Actions Items:
Related emails:
  1. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from schepers@w3.org on 2008-11-02)
  2. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from fantasai.lists@inkedblade.net on 2008-10-30)
  3. RE: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from ishida@w3.org on 2008-10-30)
  4. SVG/profiles/1.2T/master text.html,1.152,1.153 (from cvsmail@w3.org on 2008-10-30)
  5. Minutes October 30, 2008 telcon (from ed@opera.com on 2008-10-30)
  6. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from fantasai.lists@inkedblade.net on 2008-10-30)
  7. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from ed@opera.com on 2008-10-30)
  8. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from fantasai.lists@inkedblade.net on 2008-10-29)
  9. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from ed@opera.com on 2008-10-29)
  10. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from fantasai.lists@inkedblade.net on 2008-10-28)
  11. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from schepers@w3.org on 2008-10-28)
  12. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from fantasai.lists@inkedblade.net on 2008-10-28)
  13. SVG/profiles/1.2T doc-svgt12.html,NONE,1.1 (from cvsmail@w3.org on 2008-10-28)
  14. Re: [SVGMobile12] Lack of BIDI 'direction' (ISSUE-2058) (from schepers@w3.org on 2008-10-28)
  15. Re: Non-Animatable Properties (was: Closing ACTION-2276) (from chris@w3.org on 2008-10-16)
  16. Re: Logistics of Open Issues (from schepers@w3.org on 2008-10-16)
  17. Non-Animatable Properties (was: Closing ACTION-2276) (from schepers@w3.org on 2008-10-15)
  18. Closing ACTION-2276 (from chris@w3.org on 2008-10-10)
  19. Minutes, 7 October 2008 SVG WG telcon (from chris@w3.org on 2008-10-07)
  20. Closing ACTION-2253 (from chris@w3.org on 2008-10-02)
  21. Minutes, SVG telcon Tuesday 23 September 2008 (from anthony.grasso@cisra.canon.com.au on 2008-09-23)
  22. Minutes, SVG telcon Tuesday 23 September 2008 (from anthony.grasso@cisra.canon.com.au on 2008-09-23)
  23. Re: [1.2T-LC] Lack of BIDI 'direction' (ISSUE-2058 ACTION-2201) (from fantasai.lists@inkedblade.net on 2008-09-18)
  24. Re: [1.2T-LC] Lack of BIDI 'direction' (ISSUE-2058 ACTION-2201) (from schepers@w3.org on 2008-09-18)
  25. Minutes, SVG telcon Thursday 18 September 2008 (from anthony.grasso@cisra.canon.com.au on 2008-09-18)
  26. Re: [1.2T-LC] Lack of BIDI 'direction' (ISSUE-2058) (from schepers@w3.org on 2008-09-17)
  27. ISSUE-2058 (BIDI 'direction'): Lack of BIDI 'direction' [Last Call: SVG 1.2 Tiny ] (from sysbot+tracker@w3.org on 2008-09-17)

Related notes:

See also: http://www.w3.org/International/articles/inline-bidi-markup/ for a clear explanation of the bidi algorithm.

Doug Schepers, 26 Sep 2008, 06:52:14

http://lists.w3.org/Archives/Public/www-svg/2008Oct/0070.html
http://lists.w3.org/Archives/Public/www-svg/2008Oct/0087.html

Doug Schepers, 10 Oct 2008, 21:55:03

This is a dup of ISSUE-2107 and is answered there

Chris Lilley, 23 Oct 2008, 15:18:59

Agree. Commenter satisfied: http://lists.w3.org/Archives/Public/www-svg/2008Oct/0243.html, http://lists.w3.org/Archives/Public/www-svg/2008Nov/0013.html

Doug Schepers, 2 Nov 2008, 19:51:09

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