List insertion problems

When inserting, replacing or appending an item into a list a user can use
the same item multiple times.  Here are a couple examples of the problem.
Assume I have a pathElement named 'path1' and 'path2' and a path segment
named 'pathSeg':
 1)	path1.getPathSegList().appendItem(pathSeg);
 	path1.getPathSegList().appendItem(pathSeg);
Two items in the list refer to the same object.

2)	path1.getPathSegList().appendItem(pathSeg)
	path2.getPathSegList().appendItem(pathSeg)  
In this case, the same object is attached to two lists.
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Blaine