ISSUE-2093: 16.2.9 by 'identity'

by 'identity'

16.2.9 by 'identity'

State:
CLOSED
Product:
SVG 1.2 Tiny: Last Call
Raised by:
Doug Schepers
Opened on:
2008-10-07
Description:
Dr. Olaf Hoffmann
<http://lists.w3.org/Archives/Public/www-svg/2008Oct/0009.html>:
[[
in 16.2.9 it is mentioned:

##
If a 'by' value is used on a non-scalar data type ( such as color or
transform ), the starting 0 delta value is to be conceptually
considered as 'identity'.
##

If this is to be interpreted within some algebraic relation, it is required to
define or to specify the binary operation a value is considered the
'identity' for. Luckily already in SMIL is defined, that this type of
animation is only available, if additive animation is supported.
The SMIL 3 CR already explains in more detail, that the starting '0' is
"the neutral element for addition for the domain of the target attribute".
Therefore the binary operation must be the addition (even or especially
because not explictly mentioned), this means if X is a value, then
X + 'identity' = X, with '+' beeing an additive operation for the space
X belongs to.
For example for RGB-colors this means the 'identity' is black, #000,
rgb(0,0,0) etc;
for vector like types this is the origin (zero length, any direction);
for lists of numbers (lengths etc) it might be a list of zeros
- right?
]]
Related Actions Items:
Related emails:
  1. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from birtles@gmail.com on 2008-12-13)
  2. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from Dr.O.Hoffmann@gmx.de on 2008-12-11)
  3. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from birtles@gmail.com on 2008-12-11)
  4. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093) (from Dr.O.Hoffmann@gmx.de on 2008-10-31)
  5. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093) (from cam@mcc.id.au on 2008-10-31)
  6. SVG/profiles/1.2T/publish animate.html,1.123,1.124 single-page.html,1.159,1.160 (from cvsmail@w3.org on 2008-10-31)
  7. SVG/profiles/1.2T/master animate.html,1.145,1.146 (from cvsmail@w3.org on 2008-10-31)
  8. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from Dr.O.Hoffmann@gmx.de on 2008-10-30)
  9. Minutes October 30, 2008 telcon (from ed@opera.com on 2008-10-30)
  10. SVG/profiles/1.2T doc-svgt12.html,1.2,1.3 (from cvsmail@w3.org on 2008-10-30)
  11. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from cam@mcc.id.au on 2008-10-30)
  12. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from Dr.O.Hoffmann@gmx.de on 2008-10-29)
  13. SVG/profiles/1.2T doc-svgt12.html,NONE,1.1 (from cvsmail@w3.org on 2008-10-28)
  14. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from Dr.O.Hoffmann@gmx.de on 2008-10-18)
  15. Minutes, SVG Marathon telcon Friday October 17 2008 (from anthony.grasso@cisra.canon.com.au on 2008-10-18)
  16. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093, ACTION-2319) (from schepers@w3.org on 2008-10-17)
  17. Re: Logistics of Open Issues (from schepers@w3.org on 2008-10-16)
  18. Logistics of Open Issues (from schepers@w3.org on 2008-10-16)
  19. Minutes, SVG telcon Tuesday 14 October 2008 (from anthony.grasso@cisra.canon.com.au on 2008-10-14)
  20. Re: [1.2T-LC] 16.2.9 by 'identity' (ISSUE-2093) (from schepers@w3.org on 2008-10-07)
  21. ISSUE-2093 (by 'identity'): 16.2.9 by 'identity' [Last Call: SVG 1.2 Tiny ] (from sysbot+tracker@w3.org on 2008-10-07)

Related notes:

No change seems to have been requested. Followup email sent to make sure.

Doug Schepers, 18 Oct 2008, 01:49:58

Agreed. Commenter satisfied: http://lists.w3.org/Archives/Public/www-svg/2008Oct/0264.html

Doug Schepers, 31 Oct 2008, 12:05:37

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