The AcDbSpatialFilter class was designed to do this. This class is used to define a spatial filter that AutoCAD uses to define the clip volume of the block reference to the xref in the host drawing.
The best approach would be to: 1. Iterate through the block definitions to determine if a block is an Xref. 2. Make a list of all such Xref names. 3. Then use a selection set filter with these names ...
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