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CAD tip CAD tip # 4155:

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The difference between XRef Overlay and XRef Attach.

A - answer The difference between overlaying and attaching an xref is in cases with multiple levels (nesting) of xrefs (A.dwg references B.dwg, which references C.dwg). If you xref-attach C.dwg in B.dwg, and then attach B.dwg in A.dwg, you can see the C.dwg contents/entities in both B.dwg and A.dwg. But if you overlay C.dwg in B.dwg, you can see the C.dwg geometry in B.dwg, but not in A.dwg.

Simply - the overlaid xref displays only one level up in the hierarchy while attached xref appears in all levels up. Overlays also allow to create circular references.

100% *  CAD 
3.12.2004    39620x  
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See also:
Tip 10394:Attach xrefs from a predefined folder (path).
Tip 9870:Xref NAME has multiple references. Not detached.
Tip 9516:Automating properties in DWG drawings - hidden gem in Express Tools.
Tip 9331:What is contextual field and why it is not updated in a block?
Tip 9299:What is the xref status "Unreferenced"?

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