Local undi-structure for an edge. This structure contains basic information for an edge of an undi_graph class object. In particular, it contains: 1 - a non-negative integer identifier for the edge; 2 - a 'source' extremal node of the edge; 3 - a 'target' extremal node of the edge; 4 - a 'start' extremal node of the edge, if the edge is directed (if the edge is not directed, this field is equal to NULL_EDGE); 5 - pointers at the positions of the edge in the different adjacent lists; 6 - a list of all markers of the edge; 7 - a list of all constraints involving the edge.



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