public ZJunctionConnectivityRule(ZSubtype edge, ZSubtype junction)
     : this()
 {
     this.Edge = edge;
     this.Junction = junction;
 }
 public ZEdgeConnectivityRule(ZSubtype fromEdge, ZSubtype toEdge)
     : this()
 {
     this.FromEdge = fromEdge;
     this.ToEdge = toEdge;
 }