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                     The Topology Rules OSID includes rules services to 
                    manage rules applied to  Edges.    
                     EdgeEnabler Rule  
                    
                     A  EdgeEnabler  is an  OsidRule 
                     that operates the enabling and disabling of a 
                     Edge  through management of the  Edge 
                     effective dates. A  EdgeEnabler  may 
                    modify the effective dates of an  Edge  to 
                    make them effective at a fture time or expire them. A 
                     EdgeEnabler  that resurrects an expired 
                     Edge  may create a new  Edge  
                    with new effective dates to preserve the audit trail of 
                    effective  Edges.    
                     Graph Cataloging  
                    
                      EdgeEnablers  are also cataloged in 
                     Graphs.   
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