This .NET class wraps the AcDbXrefObjectId ObjectARX class. 

The purpose of XrefObjectId is to provide a convenient way to refer to a specific DBObject within an xref'd database. XrefObjectId is persistent across drawing sessions. 

Note that if the object in question is wblock'd into another file, the XrefObjectId still refers to the original object, and not to the new object.

Public Structure XrefObjectId
End Structure

public struct XrefObjectId {
}