GetRingEdges — Returns an ordered set of edges forming a ring with the given edge .
getfaceedges_returntype GetRingEdges(varchar atopology, integer aring, integer max_edges=null
Returns an ordered set of edges forming a ring with the given edge. Each output consists of a sequence and a signed edge id. Sequence numbers start with value 1. A negative edge identifier means that the given edge is taken backward. You can pass a negative edge id to start walking backward.
max_edges is not null no more than those records
are returned by that function. This is meant to be a safety parameter
when dealing with possibly invalid topologies.