ExternalFileUtils.IsExternalFileReference
Description:
Determines whether the given element represents an external file.
Determines whether the given element represents an external file.
Remarks:
CAD imports are not external file references, as their data is brought fully into Revit. No connection is maintained to the original file.
A link may be an external resource without being an external file.
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The element elemId does not exist in the document
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A non-optional argument was null