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How I determine if an xref is clipped and also how do I get it's clipping boundaries

In the AutoCAD .NET API you can access xrefs through BlockReference entities in the BlockTableRecord. You know that they are an xref if their parent block table record has the IsFromExternalReference or IsFromOverlayReference property set to true. How do you determine if the xref is clipped? How do you determine what that clipping boundary is? I'm up for solutions using .NET or COM. I need this for a program I have that does batch mirroring of a bunch of drawings. The situation is that I can determine this through the command line by trying to create a temporary polyline around the xref, but it would be much cleaner and faster if I could do this without the command line.

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