Graphics Programs Reference
In-Depth Information
FIGURE 14.12
The expanded
Layer list
6. Click OK to bind the Floor1|WALL layer.
7. Open the Layers palette.
8. Scroll down the list and look for the Floor1|WALL layer. You won't find it. In its place is a
layer called Floor1$0$WALL.
NESTING XREFS AND USING OVERLAYS
Xrefs can be nested. For example, if the Common.dwg file created in this chapter used the Unit.dwg
file as an Xref rather than as an inserted block, you would still get the same result in the Xref-1.
dwg file. That is, you would see the entire floor plan, including the unit plans, when you opened
Xref-1.dwg. In this situation, Unit.dwg would be nested in the Common.dwg file, which is in turn
externally referenced in the Xref-1.dwg file.
Although nested Xrefs can be helpful, take care in using Xrefs this way. For example, you might
create an Xref by using the Common.dwg file in the Floor1.dwg file as a means of referencing walls
and other features of the Common.dwg file. You might also reference the Common.dwg file into the
Floor2.dwg file for the same reason. After you did this, however, you'd have three versions of the
Common plan in the Xref-1.dwg file because each Xref would have Common.dwg attached to it.
And because AutoCAD would dutifully load Common.dwg three times, Xref-1.dwg would occupy
substantial computer memory, slowing your computer when you edited the Xref-1.dwg file.
To avoid this problem, use the Overlay option in the Attach External Reference dialog box. An over-
laid Xref can't be nested. For example, if you use the Overlay option when inserting the Common.
dwg file into the Floor1.dwg and Floor2.dwg files, the nested Common.dwg files are ignored when
you open the Xref-1.dwg file, thereby eliminating the redundant occurrence of Common.dwg. In
another example, if you use the Overlay option to import the Unit.dwg file into the Common.dwg
file, and then attach the Common.dwg into Xref-1.dwg as an Xref, you don't see the Unit.dwg file
in Xref-1.dwg. The nested Unit.dwg drawing is ignored.
 
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