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An external reference (xref) is a kind of a block in that it is stored in the current drawing's block library. However, unlike a block, the objects associated with an xref definition are not stored in the current drawing; they are stored in another drawing file. When you create an xref, the entire contents of this other file are imported as a block. See Blocks.
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Xrefs are usually used to display the geometry of a common base drawing in the current drawing, such as a frame. They can be taken from files any formats readable by TurboCADDoubleCAD.
Only files that have objects in Model Space can be added as Xref's.
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If you click on the External References button at the top of the Block palette you will see the External References panel at the bottom of the palette.
When xref's are nested in other drawings they are shown in a tree format listed below that referenced drawing.
Right-clicking on any of the xrefs listed in the external References panel will open the following local menu:
Open: will open the xref in TurboCADDoubleCAD.
Reload: will reload the reference file, including any updates.
Detach: will detach the referenced file, and any insertions of that file in the drawing will be deleted. You cannot detach nested xrefs. You must open the file to which they are attached to remove them.
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