ISSUE: does the 'highlight' object behavior revert to full-picture view?

[Lofton Henderson <lofton@rockynet.com>]

 From Ben's comments and Dieter's comments:
http://lists.oasis-open.org/archives/cgmo-webcgm/200504/msg00017.html
http://lists.oasis-open.org/archives/cgmo-webcgm/200506/msg00021.html

At 04:34 PM 4/21/2005 -0400, Benoit Bezaire wrote:
>   - When we say: The resulting view is a full-picture view, not a
>   zoomed view... Do we zoom out even if the target rectangle already
>   fits in the viewer's viewport?

At 04:34 PM 4/21/2005 -0400, Dieter wrote:
>3.1.2.4.3
>The definition of highlight is in contradiction with the table in 
>3.1.2.4.1. The table suggests that highlighting does not cause navigation.
>Suggestion: Delete "The resulting view is a full-picture view, not a 
>zoomed view."

The present descriptions of 'highlight' object behavior says that it 
reverts to a full picture view.  The table, on the other hand, says that it 
has no navigation effects.  Dieter proposes that the table is correct, and 
the text is wrong.

If Dieter's view is correct, then the set of object behaviors is broken -- 
it has these two problems at least:

i.) No way to get full-picture view.  Once the view has changed from full 
picture, e.g., the user pans and zooms an initial full-picture view with 
the viewer controls, there is no object behavior that can get you back to a 
full picture view.  (If all view changing is removed from 'highlight', a 
'full' keyword is needed to fix this.)

ii.) The 'highlight' keyword is useless.  When a program or an XCF issues a 
'highlight' behavior, it has no way of knowing what is the present 
view.  Another DOM or WebCGM or XCF transaction may have changed it.  Or 
the user may have panned/zoomed the picture with viewer controls.  It is 
unknowable, in general, whether the target to be highlighted is 
visible.  Therefore, no one would risk using 'highlight' (or 
'highlight_all').  Only 'move_highlight' or 'zoom_highlight' have any 
usefulness.

Alternative 1.  no change, 'highlight' is a full-picture 
view.  (Editorially fix any contradictions.)
Alternative 2.  Highlight does no navigation, leave the problems i. and ii. 
broken as described above.
Alternative 3.  Highlight does no navigation, remove 'highlight' from 
table, add 'full', 'full_highlight', and 'full_highlight_all' to table (12 
rows in the table.)

(Alternative 4.  Revert to WebCGM 1.0 definition.)

RECOMMENDATION.  Alternative 1.

-Lofton.