\Edge(tag1,tag2)                         \EdgeFrom(tag1,x1,y1,tag2) 
\EdgeAt(tag1,x1,y1,tag2,x2,y2)           \EdgeTo(tag1,tag2,x2,y2) 
\CurvedEdge(tag1,tag2) 
\CurvedEdgeSpec(direction1,tension 1,direction2,tension 2) 
\CurvedEdgeAt(tag1,x1,y1,tag2,x2,y2) 
                    (direction1,tension 1,direction2,tension 2) 
\CycleEdgeSpec(direction,distance) 
\CycleEdge(tag1)