re: [cgmo-webcgm] ISSUE: change VDC to NVDC in OBJECT?

[Don Larson <dlarson@cgmlarson.com>]

Lofton,

2A sounds like the best way to go.

Regards, 
Don.


  > From Dieter's comments:
  > http://lists.oasis-open.org/archives/cgmo-webcgm/200506/msg00021.html

  > ISSUE:  should 2.0 change VDC to NVDC in the VIEWPORT 'param' sub-element 
  > of the 'object' element?

  > >VIEWPORT topx topy botx boty
  > >This should no longer use VDC coordinates but NVDC instead.

  > DISCUSSION.  We have defined NVDC to be the coordinate system of DOM 
  > transactions with the metafile.  WebCGM 1.0 defined VDC to be the 
  > coordinates to used for VIEWPORT 'param' sub-elements of the 'object' 
  > element, in HTML content.  Changing the specification for 2.0 would mean 
  > that any 1.0 HTML documents would break with a 2.0 viewer.

  > Alternative 1.  Leave 1.0 specification as is (VDC) for 2.0.
  > Alternative 2.  Define a new 'param', VIEWPORTN, with NVDC coordinates and 
  > deprecate the VIEWPORT (VDC) 'param'.

  > (Note:  I'm not proposing "change VDC to NVDC for VIEWPORT", because I 
  > think it's a bad policy to make changes that break existing content.)

  > RECOMMENDATION:  Alt.1 -- leave it as is.

  > Regards,
  > -Lofton.