(connection-topology 'eps)
-> a list of connection descriptors specs denoting,
`((connected-terminals ,from-junction-name ,to-object-terminal ,to-object-name
,@edge-specs)))
means that connections between the specified terminals and junctions in the model named EPS.
If edge-specs are provided then they tell the window system how to draw the connection.
If they are specified they should be of the form (<<n>> ((x1 y1) ...(xn yn))),
where n is the number of intermediate vertices in the connection and the respective (xi yi)
pairs are used to position the points at which the connection articulates.