2013

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with a number. If you explode the block in AutoCAD 2007 (or earlier releases),
and then open the drawing in AutoCAD 2008 (or later releases), each scale
representation becomes a separate annotative object, each with one annotation
scale. It is recommended that you do not edit or create objects on these layers
when working with a drawing created in AutoCAD 2008 (and later releases)
in AutoCAD 2007 (and earlier releases).
When visual fidelity for annotative objects is not selected, a single model
space representation is displayed on the Model layout. Depending on the
setting of the ANNOALLVISIBLE system variable, more annotation objects
may be displayed on the Model layout, and more objects may be displayed
in paper space viewports at different sizes than in AutoCAD 2008 and later
releases.
Annotative Object Properties in Previous Releases
In an AutoCAD 2008 drawing, when an annotative block does not have its
paper orientation set to match the layout, and the block contains multiline
attributes that are based on a text style that is not set to match the orientation
of the layout, the attributes may shift positions if you open this drawing in
AutoCAD 2007 (and earlier releases).
Layer Property Overrides in Previous Releases
When you open an AutoCAD 2008 drawing containing layer property
overrides, overrides are not visible. The property override settings are retained
when the drawing is saved in a previous release, and are visible again when
the drawing is opened in AutoCAD 2008.
If a viewport containing layer property overrides is deleted when the drawing
is opened in a previous release, the override settings are not retained and are
not available when the drawing is opened in AutoCAD 2008.
When the VISRETAIN system variable is set to 0 when the drawing is opened
in a previous release, xref layers containing viewport property overrides are
not retained.
If you open an AutoCAD 2008 drawing in a previous release, property overrides
may display in a thumbnail image. When the drawing is saved with a layout
tab, and then opened in the previous release, those property overrides do not
display.
696 | Chapter 11 Share Data Between Files