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summary - models for control and display

Roger and I (dean incase this header is munged) discussed abstract
models for display which support editing and screen repair.  For
example, imagine a stencil and paint model (ala postscript) with a
static model to represent the display actions.  Editing operations on
that data-structure translate to incremental updates (repairs) of the
actual screen.  Now build on that some kind of constraint system
(minimal, to be sure) that says things like "put a bunch of characters
along this path", "put a rectangle around this display structure", or
" texture map this text onto the surface of that teapot."  The
constraint layer also needs an editable representation that
incrementally updates the image representation structures.  Finally,
how do you select displayed objects.

our discussion will continue.