@author Jörn W. Janneck, Steve Neuendorffer
@version $Id: Dataflow.java,v 1.39 2005/10/28 22:01:50 cxh Exp $
@since Ptolemy II 4.0
@Pt.ProposedRating Red (cxh)
@Pt.AcceptedRating Red (cxh)
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