ISSUE: change VDC to NVDC in OBJECT?

[Lofton Henderson <lofton@rockynet.com>]

 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.