A graph package topological error. GraphExceptions are usually thrown by MutableGraphModels in response to changes which could not be made for one reason or another. For example, a composite node might want to disallow a node of the wrong type to be placed inside it.
@author Steve Neuendorffer
@version $Id: GraphException.java,v 1.11 2005/07/08 19:55:01 cxh Exp $
@Pt.AcceptedRating Red
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